The male half of the same measurement: names the shelter records sex male at 65% or more. It is a longer list than the female one, which is a fact about shelter intake rather than about naming. Species-specific lists are at male dog names and male cat names.
Is there a male equivalent of a unisex name?
A name is only unisex here when its sexed records land between 35% and 65% female. Those are listed separately in the unisex pet names guide, linked from this hub.
Why are there more male names than female ones?
Because more sexed shelter records are male. It is a property of the source data, not a claim that male animals have more names available to them.
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.