From a Manx surname, a variant of the Irish surname MacDermott meaning "son of DIARMAID". Theodore Roosevelt used it for one of his sons. The name is now associated with Kermit the Frog, one of the Muppets created by puppeteer Jim Henson.
Perhaps means "without envy" in Irish. In Irish mythology this was the name of a warrior who became the lover of Gráinne. It was also the name of several ancient Irish kings.