Some religions, have various Saints, for example St Christopher, who is meant to watch over folk who travel (but may have something to do with Bachelors too, possibly). 

Many others though are the representative for a certain cause or problem. So, if you are suffering from an ailment, have a problem, or a fear, there are specific saints who are told to be able to look after you and guide you through your issues. But some are a little more bizarre than others, and I suspect Terry Pratchett may've used some of these as inspiration for his Small Gods on the discworld, in particular the 'Oh God' of Hangovers. 

I'm not trying to mock religion here by any means, everyone is entitled to their own beliefs, and I utterly respect that. But when I came across these, I was genuinely surprised at some of the various patronages, and thought I'd share. 

These are apparently real saints, I'm not sure I could make some of these up...

St. Clare of Assisi - Television Writers

St. Genesius - Actors/Comedians (and some comedians are sheer genius, or possibly of the genus genius)

St. Barbara - Fireworks/Guns/Bombs

St. Drogo - Ugly People and Coffee (really?)

St. Monica - Alcoholics

St. Clotilde - Disappointed Children (that's a busy saint at some times of the year)

St. Bibiana - Hangovers (wonder how Bibiana and Monica get on, and was imbibe named after Bibiana or the other way around? Brian, we must make haste to Google...)

St. Sebastian - Unruly Children (who I imagine gets a few of Clotilde's cast offs)

St. Lidwina - Ice Skaters (anyone who's ever tried to learn to ice skate probably does some praying, let's face it)

St. Cajetan - Unemployed People

St. Cornelius - Twitching (not sure if this is a physical twitch or birdwatchers)

St. Hubert of Liege - Fear of Werewolves (one would assume this is folk afraid of werewolves rather than a specific subset of fear getting it's own saint)

St. Gummarus - Lumberjacks

St. Elgius - Gas Station Workers

St. Fiacre - STDs (someone woke up late on "Today we hand out patronage day"

St. Polycarp of Smyrna - Dysentery

St. Isadore of Seville - Computers/The Internet (also a busy saint)

St. Joseph of Cupertino - Astronauts

St. Roch - Gravediggers

St. Giles - Breastfeeding (kinda surprised this one isn't a lady)

St. Christopher - Bachelors

St. Gertrude of Nivelles - Fear Of Mice (standing just before St. Fiacre in the queue)

St. Amrose - Beekeepers

St. Nicholas - Prostitutes

I know there are a lot more, but these just kinda stood out. I still love Pratchett's various small gods of things though, particularly the minor goddess of Things That Stick in Drawers, Anoia