-o does for male-read names what -a does for female-read ones: an open vowel that survives a shout. Milo, Bruno, Rocco, Zorro. There are 1,250 in the catalogue. Compare names ending in A.
Are -o names male?
They read that way in English and the measured gender usually agrees, but the site records gender from shelter data rather than from the ending, so each name says what its own records say.
How many pet names end in O?
1,250 in this catalogue. The ending is recorded from the spelling, which is what makes it filterable.
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. Browse the whole catalogue or read how the data is put together.