Since Starfleet Personnel use a stardrive on a starship to travel to starbases and star systems why not call them starmen or astromen?
Not politically correct. What about women? Or races without gender? Knowing how things work, we'll have to use stiff and awkward names like "starperson" or "starbeing", and nobody
In today's U.S. Navy, a midshipman is a midshipman and a seaman is a seaman, regardless of gender. Same with the rank of airman in the Air Force.
"Astroman" sounds like a Japanese anime superhero. And "starman" sounds like this dude.