Learned borrowing from Mongolian нийгэм (niigem) or inherited from Written Oirat ᠨᡄᡅᡎᡄᡏ (neigem).
ниигм • (niigm) (Clear script spelling ᠨᡄᡅᡎᡄᡏ (neigem) or ᠨᡄᡕᡅᡎᡄᡏ (neyigem))