This is not a chapter. This is purely to help you out if the multiple names or Chinese terms of address are giving you trouble.

Wei Wuxian
Birth Name: Wei Ying / Courtesy Name: Wei Wuxian / Title: Yiling Laozu
     Sword: Suibian
     Dizi (type of flute): Chenqing
     Hufu (Tiger tally): Yin Hufu
     Son of Wei Changze and Cangse Sanren.  Taken in by the YunmengJiang sect when he was nine.  At start of this story the destruction of the Yin Hufu causes a backlash that sends his consciousness back in time.

Lan Wangji
Birth Name: Lan Zhan / Courtesy Name: Lan Wangji / Title: Hanguang-jun
     Sword: Bichen
     Guqin (Zither): Wangji
     Younger brother of Lan Xichen. Has a reputation for being honourable, but cold and rigid.  Most people, even those older than him, find him intimidating.

Lan Xichen
Birth Name: Lan Huan / Courtesy Name: Lan Xichen / Title: Zewu-jun
      Sword: Shuoyue
      Xiao (type of flute): Liebing
     Heir/Sect Leader of GusuLan sect.  Assumed the duties of leadership as a teenager since the Sect Leader, his father, was in seclusion.

Wei Qing
Birth Name: Wei Qing / Previous Name: Wen Qing
     Distant cousin of Wen Rouhan.  In the future she and the remaining members of her branch of the family take the huge step of changing their surname as part of adopting Wei Wuxian into their family.  She is the older sister of Wei Wuxian and Wei Qionglin.  It is unclear how, but the backlash of Yin Hufu has also sent her consciousness back in time. 

Wei Qionglin
Birth Name: Wei Ning / Courtesy Name: Wei Qionglin / Title: Gui Jiangjun (Ghost General)
Previous Names: Wen Ning / Wen Qionglin
     Distant cousin of Wen Rouhan.  His surname was changed along with the rest of his family  in the future as part of adopting Wei Wuxian.  Younger brother of Wei Qing and Wei Wuxian.

Wei Nuan
Birth Name: Wei Nuan / Previous Name: Wen Nuan
     Wei Yuan's older sister.  In the original timeline she died, most likely in the labour camp before Wei Wuxian rescued the Dafan Wens.

Wei Yuan
Birth Name: Wei Yuan / Previous Name: Wen Yuan
     Youngest member of the Dafan Wens to survive the war/labour camps.  He was adopted by Wei Wuxian when they were living in the Burial Mounds.

Jiang Yanli
Birth Name: Jiang Yanli
     Oldest child of Yu Ziyuan and Jiang Fengmian.  Older sister of Jiang Wanyin, and treats Wei Wuxian as a little brother even though there was no formal adoption.

Jiang Wanyin
Birth Name: Jiang Cheng / Courtesy Name: Jiang Wanyin / Title: Sandu Shengshou
     Sword: Sandu
     Whip: Zidian
     Youngest child of Yu Ziyuan and Jiang Fengmian.  Heir of the YunmengJiang sect.

Jiang Fengmian
Courtesy Name: Jiang Fengmian
     Sect Leader of YunmengJiang sect.  Found Wei Wuxian on the streets and brought him to Lotus Pier.

Yu Ziyuan
Birth Name: Yu Ziyuan
     Whip: Zidian
     Madam of YunmengJiang sect. 

Lan Qiren
Courtesy Name: Lan Qiren
     Younger brother of Qingheng-jun.  Raised his two nephews and assumed the duties of sect leader in his brother's place until Lan Xichen was old enough to take over.

Qingheng-jun
Title: Qingheng-jun
     Father of Lan Xichen and Lan Wangji.  Technically Sect Leader of GusuLan sect, but has been in seclusion the entirety of his sons' lives.

Luo Qingyang
Birth Name: Luo Qingyang / Nickname: Mianmian
     Disciple from the WuzhouLi sect.

Nie Huaisang
Courtesy Name: Nie Huaisang / Title: Head-Shaker
     Younger brother of Nie Mingjue.  Has been sent to study in Cloud Recesses multiple years in a row because he keeps failing.  Has no interest in his family's method of cultivation, deceptively observant and knowledgeable about things that interest him.

Nie Mingjue
Courtesy Name: Nie Mingjue / Title: Chifeng-zun
     Saber: Baxia
     Sect Leader of the QingheNie sect.  Known to be short tempered and have a strong sense of justice.  Holds a grudge against the QishanWen sect ever since Wen Rouhan got Nie Mingjue's father killed.

Jin Zixuan
Courtesy Name: Jin Zixuan
     Sword: Suihua
     Heir of the LanlingJin sect. Has an uncountable number of half siblings, most of whom he has never heard the names of, let alone met them.

Jin Guangyao
Courtesy Name: Jin Guangyao / Previous Name: Meng Yao / Title: Lianfang-zun
     Sword: Hensheng
     Illegitimate son of Jin Guangshan.  Extremely intelligent and extremely obsessed with his father's approval, among other things.  He is one of the few illegitimate children to ever be claimed by Jin Guangshan.  This occurs after the war where he proves himself as a valuable spy, serving as Wen Rouhan's Principle Torturer.

Jin Guangshan
Courtesy Name: Jin Guangshan
     Sect Leader of LanlingJin sect.  He is a pig.  He is an insult to all pigs.  He sleeps with many women, abandoning them as soon as he is bored and abandoning any children he fathers along with them.  He is also a rapist and just generally a garbage person.

Jin Zixun
Courtesy Name: Jin Zixun
     Almost as charming of a person as his uncle, Jin Guangshan.  He is the cousin of Jin Zixuan and he make the arrogant heir look modest.   His only skills involve being a bully and shooting his mouth off.

Wen Rouhan
Courtesy Name: Wen Rouhan
     Sect Leader of the QishanWen sect.  The QishanWen sect is the most powerful of all of the major sects and Wen Rouhan seems to think that all sects should subject themselves to his authority.

Wen Xu
Courtesy Name: Wen Xu
     Oldest son of Wen Rouhan.  He leads the attack on Cloud Recesses and several other battles during the war.

Wen Chao
Courtesy Name: Wen Chao
     Second son of Wen Rouhan.  Extremely arrogant, but no skill to back it up.   He cycles through his various wives and mistresses, picking a new favourite roughly every six months.  He is extremely petty and not very intelligent.

Wen Zhuliu
Courtesy Name: Wen Zhuliu / Title: Huadan Shou
     Was not a Wen by birth.  He adopted the surname, presumably as part of his immense gratitude toward Wen Rouhan.  He is famous for the terrifying ability to destroy the golden cores of other cultivators, rendering them unable to ever cultivate again.  He demonstrates a greater sense of honour than most of the Qishan Wens, but follows the orders of Wen Rouhan religiously.

Wang Lingjiao
Birth Name: Wang Lingjiao
     Current favourite mistress of Wen Chao.  Extremely jealous and possessive of Wen Chao and his attention. 

Baoshan Sanren
     A famous immortal who lives on an unnamed mountain. She frequently takes in orphaned children as disciples.  If a disciple chooses to leave, they take an oath to never return to the mountain.  Wei Wuxian's mother was one of only three disciples of Baoshan Sanren ever known to leave the mountain.

Familial Terms and Honorifics

Brother

Di: younger brother or younger male friend. Can be used alone or as an honorific
Didi: Younger brother or younger male friend. More casual than saying "Di"
Ge: Familiar way to refer to an older brother or older male friend. Can be used alone or as an honorific
Gege: Familiar way to refer to an older brother or older male friend. Has a cutesy feel and can be used to express being very close. It is frequently used in intimate addresses. It is not intrinsically flirtatious but is frequently used that way.
Xiong: Older brother, usually used as an honorific. Formal, but also used informally between male friends of equal status.
Xiongzhang: Eldest brother (very formal)

Sister

Mei: Younger sister or younger female friend. Can be used alone or as an honorific
Meimei: Younger sister or unrelated younger female friend. Casual.
Jie: Older sister or older female friend Can be used alone or as an honorific.
Jiejie: Older sister or an older female friend. More casual than "Jie."
Jiajie: Older sister (Respectful)

Parents

Fuqin: father (polite/formal)
Muqin: mother (polite/formal)
Die: dad
Niang: mom

Uncle

Jiujiu: Uncle (Maternal, biological)
Shufu: Uncle (paternal, biological) Formal address for your father's younger brother.
Shushu: An affectionate version of Shufu

Disciple Relationships

Shidi: younger martial brother
Shixiong: older martial brother
Shijie: older martial sister
Shimei: younger martial sister

Multiple People of the Same Address

If multiple relatives are in the same category, they will be assigned numbers by order of birth. Examples: If you have 3 older brothers the oldest would be "da-ge," the second oldest "er-ge," the third oldest "san-ge." In english it would sound like 1st brother, 2nd brother, 3rd brother. If you are the oldest brother and had two younger brothers you would call the oldest of your two younger brothers "er-di" and the youngest "san-di."

Diminuitives

Xiao- diminutive prefix meaning little.
-er: added to the end off a name expresses affection
A-: diminutive prefix added usually to monosyllabic names or a single syllable of a two syllable name. It has friendly and affectionate connotations.
Doubling a syllable of someone's name creates a cute childish nickname.

Other Terms of Address

Gongzi: Usually translated as "master" or "young master". Think term of respect rather than master versus servant. (It is also how a servant would refer to their master in this story, but unlikely you will see this usage in "Backlash".)
Guniang: feminine version of gongzi
Qianbei: Polite address for someone who is your senior
Xiansheng: Teacher/Sir but with a heavier connotation of respect. Within Cloud Recesses this exclusively refers to Lan Qiren.
Zongzhu: Sect Leader (I will probably use the english translation throughout this story.)
Shifu: Martial arts teacher/master
Laozu: grandmaster, like the progenitor or founder of a sect or cultivation path

Useful Notes

-Jun: Suffix meaning lord.
-Zun: Suffix meaning esteemed/venerable. More respectful than "-jun".

Weiqi - a strategy game also known as Go
Jinbu - an accessory worn at the waist. There are many different designs. They can include jade pendants, precious metals, beads, and tassels. These were worn by both men and women.

Courtesy Names

Courtesy Names are given when an individual comes of age. It is usually a male only tradition. In Mo Dao Zu Shi characters seem to receive their courtesy names as young as fifteen. Addressing someone by their birth name after they have received their courtesy name is disrespectful unless you are their elder, spouse, or close friends.

Sect Names

Sect names are composed of two parts. The second part is the surname name of the Clan that leads the sect. The first part is the name of the area the sect resides in. (Example: The GusuLan Sect is led by the Lan Clan and is based in Gusu.)

Surnames after marriage

A spouse does not change their last name when they get married. They retain their original surname. Example: Yu Ziyuan's last name remains "Yu" after getting married. Where things get a little weird is when going by Yu-furen (Madam Yu). Usually she would be addressed as the Madam of the Jiang clan. The same way Lan Wangji's mother was Madam Lan, and Jin Zixuan's mother was Madam Jin. Their surnames don't change, but this title is referring to their status as the wife of the respective clan leaders.

Credits

Most of the information included on this page is from, "Grandmaster of Demonic Cultivation" (Mo Dao Zu Shi), by Mo Xiang Tong Xiu, translated by Suika & Pengie (editor).

I also use (https://modao-zushi.fandom.com/wiki/Grandmaster_of_Demonic_Cultivation_Wiki) extensively both on this page and throughout this story to check names, locations, and timelines of events in the original work.

Some of the info on this page came from other places, but it was so many and so long ago that I cannot for the life of me remember where.  If I do figure it out, I will add the info for said sources.