Zeke is a casual form of the name of an important prophet. How well Zeke holds up depends on the boy: it could be a cooler alternative of Zack, or it could prove too close to "geek". In the USA, it has steadily risen in popularity the past 4 years, reaching #736 in 2014. Both Zeke and Ezekiel continue to be less popular over the pond in the UK.
On Sons of Anarchy, Zeke is spelled Zeek.