If you read between the etymology of Picard it can be interrupted as "Peace Keeper". It's more literal translation tends to be more along the lines of "pick apart" as if to investigate or find deeper meaning behind it. One could probably also interrupt the name to have a broader "Negotiator" type meaning too, so it does track with his personality.
Kirk is a little weirder one. It translates directly into "Church" from Norse or Danish but often carries the meaning "Holy one". I'm not quiet sure how to interrupt that one. It seems more like that name was picked almost exclusively because it sounded "tough".
Since you're going down names of captains, I suppose I'll toss out Janeway's name largely translates into "Pathfinder" or "Seeker".
Riker's last name doesn't have a specific etymology track. The name Riker was likely derived from something such as possibly Reick or Rickert. Depending what path you want to follow the etymology on his last name, it could have a lot of meanings, none which pop out at me as a backlog characterization for someone. Reick for instance tracks being something of hermit while Rickert tracks to being something related to a low class soldier.
