selfname

A proper name; a name for one's own self, as opposed to one's family; one's real name.

Surnames are, with a few exceptions, monosyllabic. Selfnames can be either monosyllabic or bisyllabic.

"Oh, Elements," she finally managed to say, sitting back against the seat cushion of the pilot's chair, "is that truly your selfname?" "James, actually."

A name given to oneself; a self-denomination or self-appellation.

Mina is the selfname of the language referred to in the literature as Hina or Besleri.

An autonym.

In the past, the Ainu (their selfname meaning 'person'), traditionally huntergatherers, occupied not only Hokkaido but also a considerable part of the island of Honshu until the middle the eighteenth century, [...]