I just like the sound of the words better. Rainier sounds sneery and mean to me and Salish Sea is a million times more poetic and fun to say than Puget Sound. Tahoma is also easy to say and unique to here, unlike Rainier.

Probably some of the more difficult to pronounce in English places will never change so you'll have that.

Also, some places are confusing, such as all the Marginal Ways in Seattle. I would like those to get new names too. We could even vote democratically on them.