Actually you guys, a team name doesn't have to resemble a color. For example, Team Funky (FNKY?) from season 3.

ALSO, I don't think the arrangement of names has anything to do with the leadership. Recall season one. AFTER RWBY was announced as a team, Weiss was still surprised that Ruby was named team leader. Same goes for team JNPR. Despite being named with Jaune first, he still seemed shocked he was being to be official leader. That DOES appear to be the trend, but I think it's a matter of coincidence that it's occurred so often in the show.