Meaning and Name Origin
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 (#6818 out of 88799, Top 8%). (2000 U.S. Census)
Below is a graphed analysis of the popularity of the boy name Fitz and related names. The only prominent related form of Fitz (#unlisted) rated in the Top 1000 is Fitzhugh. This boy name reached the peak of its popularity during 1890-1899 and has become less widespread since. (2014 Birth Statistics)