Olsen (Danish) comes from Danish Ole, from Danish Olaf, from Old Norse Óláfr, from Proto-Norse ᚨᚾᚢᛚᚨᛁᛒᚨᛉ, from Proto-Germanic anulaibaz, from Proto-Germanic laibō, from Proto-Indo-European leyp-, from Proto-Indo-European lēy- — to leave, let; to want, desire; to let; leave...