What does Fitz mean?
Fitz \f(i)-tz\ as a boys' name is pronounced fits. It is of Old French origin, and the meaning of Fitz is "son of". Usually used as surname prefix. Derives from the Norman "filz" or "son". See Fitzpatrick, Fitzhugh, Fitzgerald, and Fitzroy.
Fitz is an uncommonly occurring given name for males but a very prominent surname for all people (#8343 out of 150436, Top 6%). (2000 U.S. Census)
The only prominent related form of Fitz (#unlisted) rated in the Top 1000 is Fitzhugh. These boy names reached the peak of their popularity during the years 1890-1899 (usage of 0.017%) and have become less widespread since. Below is a graphed analysis of the usage of Fitz and related names. (2014 Birth Statistics)