Lothar \l(o)-thar\ as a boy's name is of Old German origin, and the meaning of Lothar is "famous warrior". The character Lothario in an early 18th-century English play gave this name connotations for awhile of a libertine or a careless seducer of women.

Lothar has 4 variant forms: Lother, Lothair, Lothario and Lothur.

For more information, see also the related name Luther.

Baby names that sound like Lothar are Louther, Lodur and Lotario.