Meaning and name origin
Fitz \f(i)-tz\ as a boy's 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 not a popular first name for males but a very popular surname or last name for all people (#6818 out of 88799, Top 8%) (Source: 2000 U.S. Population Census).
Displayed below is a comparison of the popularity of the boy name Fitz and related names. The only popular variation form ranked in the Top 1000/100 is Fitzhugh. (Source: 2014 Birth Name Statistics).