In the Poldark novels (published 1945-2002) by Winston Graham, Garrick is the name of the character Demelza's dog. See https://en.wikipedia.org/wiki/Poldark for reference.
A famous bearer (since the Harry Potter series is so popular) is the wandmaker Garrick Ollivander.Also, there's a character in Star Trek: Deep Space Nine whose name is spelled Garak but pronounced like this name. He's an exiled Cardassian tailor and former spy (well, he switches back and forth between "former" and "current", the show has a lot of politics in it), and surprisingly one of the best developed characters in the show.