How popular a pet’s name becomes changes from one country to another, even if those countries use the same principal language. Popularity also changes over time. Max and Chloe topped the Veterinary Pet Insurance list in 2011, and those results were released in 2012. No later data is available.

VPI had a relatively easy task in collecting data, as pet names are on the insurance policies the company sells and records. Its 2012 list was culled from more than 475,000 insurance policies issued in 2010.

Pet names can be determined from a number of registrations, not only of pet insurance policies but also of implanted microchips and breed registries. “Find Cat Names” researched the use of its search engine. The Chicago Sun Times scoured governmental databases. The Cook County (home county of Chicago, Illinois) checked its vaccination records. Gallop polled pet owners.

Considering the different methods, it is small wonder that the results on the different published lists fail to agree. YourPet.com, BabyNames.com, BowWow.com, PetFinder.com, The Washington Post, Gallop (the polling organization), Cook County, and the Sun Times all have published lists in the United States. They all differ.

More Info: en.wikipedia.org