Geir is a male name common in Iceland and Norway, rare in Sweden, and very rare in Denmark. It is an ancient Nordic name meaning "spear". In Norway, its popularity peaked in the late 60's and early 70's.

( gear), goods, tackle of a mill; e.g., household gear, or “ lyeing and goeing geir" of a mill, some parts of which went to the tenant, while others remained the property of the landlord.

Someone who has become Jewish through the laws of conversion