Well, I don't have an opinion. I did learn, though, that Hermosillo was named after General JoséMaría González de Hermosillo (who never made it to his namesake). So the name Hermosillo did not devolve from hermoso. Pitic has a nice sound, but then I prefer Datsun to Nissan any day.
For more on this subject read the interesting and varied, or interestedly varied, Border Reporter: IT’S NEITHER HERE NOR THERE, BUT WOW, IS IT ENTERTAINING by Dhiana Quiroz