Mitras

Cf. lit. Mitrà, Mitris, Mi̇̀trius (see), Latv. Mitris ¹. Perhaps nicknames surn., derived from lit. mi̇̀tra, mitrùs „vikrus, miklus; apsukrus, guvus, gudrus, gabus“ (LKŽ VIII 298-299). However, it is not impossible that sometimes they are derived from the baptismal name Dimi̇̀trijus, cf., let's say, Ukr. Mumpo: Дмитpo ².