very unrealistic. the nazis were extremely anti-anything of foreign origin. most members of the nazi party were born during the last 20 years of the 19th century, a time when prussian names, strong in tutonic tradition were common. however, if you really do love the name and cannot find something similar from the germanic tradition, perhaps you could make it clear that your character comes from a french border region such as alsace-lorraine, known for causing problems between the french and the german over mining territory. good luck.