What does Quincy mean?
Quincy /quin-cy/ as a girls' name (also used more commonly as boys' name Quincy). Quincy's root is Old French, and the meaning of Quincy is "counsel; estate of the fifth son". Quincy is an alternate spelling of Quinn (Irish, Gaelic) with the suffix -cy. Quincy is also a derivative of Quincey (Old French): place name.
How popular is Quincy?
Quincy is an uncommon first name for females but a very popular surname for both adults and children (#25006 out of 150436, Top 17%). (2000 U.S. Census)
The only prominent alternative form of Quincy (not ranked) is Quinn (#126 the previous year). Other forms, like Quinci, are uncommon. This relation of Quincy was favored by parents in 2013 (usage of 0.882%) and is almost as popular today (usage 0.874%, down 1%). Shown below is a comparison of the usage of the girl name Quincy and affiliated names. (Top 1000 Birth Names Statistics, 2014)