Bailey is definitely one of the most popular boy dog names. At this site
MOST POPULAR DOG NAMES : list of most POPULAR PUPPY NAMES Bailey ranked 4, petplace
Top Names for Dogs! ranks it at 5. Dogster ranks it at 7th in popularity
Dogster Dog Names Buddy, Max, and Jake, beat it in all three places, but the lists are for all dogs, not just Yorkies.