Rimašas

Cf. lit. Rymašas, Rimašius, Rimošáitis (see). It is not entirely clear whether with the suffix -aš-, -oš- from Lit. Ri̇̀mas (see), could it also be from the baptismal name Rimma (see Rimà), cf. Brus Pымашэўcкi: Pимма ¹.