Blanche

Surprisingly, this name is very much old-fashioned nowadays, with only 6 baby girls being recorded with the name Blanche in 2022 according to the USA Social Security Administration.
https://www.nancy.cc/baby-name/blanche/

Also Judeo-French and Judeo-Anglo-Norman.
Source: Seror, Simon "Les noms des femmes juives en Angleterre au Moyen Âge".

In 2018, 87 is the most common age for an American (U.S.) Blanche who is registered female with the Social Security Administration. It is the 1, 221st most common female first name for living U.S. citizens.

More than 99.9 percent of people with the first name Blanche are female.
Also Breton.