From Old Irish gilla; compare English child, Old English cild. Zimmer thinks it is borrowed from the Old Norse gildr (“stout, brawny, of full worth”), English guild, Old English gild (“payment”) (see geall), gilda (“fellow”).
gille m (genitive singular gille, plural gillean)
- (dated) servant, follower
- boy, lad, youth (male aged from the toddler years to about the middle twenties)
- man, boy (as a familiar address for a male of any age)