Lambertha

Lambertha is the feminine form of the Germanic name Lambert. The name Lambert itself is derived from the Old High German elements 'land' meaning "land" and 'beraht' meaning "bright" or "famous." While Lambert has a long history, particularly in medieval Europe due to several saints and notable figures, the feminine form Lambertha is much rarer. It would have been used to honor a male Lambert in the family or to bestow the positive attributes of the name onto a daughter.

Historically, feminine forms of male names were common, especially in Germanic cultures. Lambertha would have been more prevalent in regions where Germanic languages were spoken, though its usage has always been quite limited compared to its male counterpart. Today, it is considered a very rare and somewhat archaic name.