What does Gun mean?
Gun /gun/ as a boys' name is of Old Norse derivation, and the name Gun means "battler, warrior". Gun is an alternate spelling of Gunnar (Old Norse): from Old Norse gunnr "strife". Compare surname Guyn.
How popular is Gun?
Gun is an uncommonly occurring given name for men but a somewhat prominent surname for all people (#91801 out of 150436, Top 61%). (2000 U.S. Census)
Prominent alternative forms of Gun (not in Top 1000) are Gunner (#235 2 years ago) and Gunnar (#381). Other forms, like Gunners, are uncommon. These relations of Gun were at the apex of their popularity in 2014 (usage of 0.692%). Gunnar is more familiar than the rest, though Gunner has become trendy as well. Below is a charted analysis of the popularity of the boy name Gun and corresponding names. (Top 1000 Baby Names Records, 2014)