There is a particular kind of name that suits a male cat: short, a little absurd, and impossible to say sternly. The registers agree — the list below is heavy on two-syllable names that end in a vowel.
The uncommon end
Rarity here is measured, not asserted: these names appear in the registers, so real cats carry them, but they hold a small share of every register they appear in.
Every count on this site is a tally of real registrations: pet licences and shelter intakes published as open data by New York, Seattle, Austin, Montgomery County, Cambridge, Zurich, Basel and three Australian councils. Popularity here is the average share a name holds across those registers, so a name common in a small city is not buried by one common in a large one. Nine of the eleven sources are North American, so read the ordering as naming in those places rather than worldwide.