Borrowed from Xibe [script needed] (helmefin), analyzable as ᡥᡝᠯᠮᡝᠨ (helmen, “shadow”) + ᡝᡶᡳᠨ (efin, “game”).
ᡥᡝᠯᠮᡝᡶᡳᠨ • (helmefin)