What does Lothair mean?
Lothair /lo-thair/ as a boys' name is of Old German derivation, and the name Lothair means "famous warrior; soldier of the people". Lothair is a version of Lothar (Old German) with the suffix -ir. Lothair is also a derivative of Luther (Old German).
(male) Lanthair, Lathair, ..
(female) Loli, Lote, ..
How popular is Lothair?
Lothair is an unusual given name for men. Lothair is an equivalently unusual last name too for both adults and children. (2000 U.S. Demographics)
Luther (#1611 last year) is the only popular alternative form of Lothair (not ranked) appearing in the Top 2000. Other variants, like Lotario, are seldom used. This form of Lothair was popular as a baby name a century ago (adoption of 0.2%) and has become significantly less popular since. Below is a graphed analysis of the statistics of the boy name Lothair and corresponding names. (2014 U.S. SSA Records)