What was Armstrong's nickname?

What was Armstrong's nickname depends on which Armstrong, as there are many famous Armstrongs with nicknames, including Neil Armstrong astronaut nicknamed First Man on Moon, Louis Armstrong musician nicknamed Satchmo, and Lance Armstrong cyclist nicknamed Big Tex. Louis Armstrong, jazz musician, nickname was Satchmo short for Satchelmouth, and Pops. Neil Armstrong, astronaut first man on Moon, nickname was Neil but called First Man. Lance Armstrong, cyclist, nickname Big Tex and Le Boss. For Armstrong Ceilings company, no nickname. If referring to Armstrong as in Armstrong flooring or tires, no nickname. Most famous Armstrong nickname is Louis Armstrong Satchmo, meaning satchel mouth for large mouth, and Pops, with Louis Armstrong known as Satchmo worldwide. Neil Armstrong called First Man on Moon. So Armstrong's nickname depends on which Armstrong, but most known is Louis Armstrong Satchmo and Pops, and Neil Armstrong First Man on Moon, with Lance Armstrong Big Tex. Without specific Armstrong, Satchmo is most famous nickname for Armstrong.