The Suburban Pittsburgh Book of the Dog
Allegheny County, Pennsylvania, is one of very few (and apparently the most populous) to publish data on its dog registrations. Nathan Fulton, a student at CMU, offers a summary of Pittsburgh Doggos By the Numbers, though it should be noted that it excludes those within city limits. (With 300k humans in town and a million more out in the burbs, assume we're missing at least a quarter of the doggos)
Ten Most Popular Dog Names in Allegheny County
Name Count
Bella 708
Lucy 474
Buddy 469
Molly 435
Bailey 424
Sadie 398
Max 393
Daisy 370
Charlie 328
Cooper 305