Names for quadruplets?

Okay, so my aunt and uncle are expecting quadruplets at the near the end of this month; the 24th or 25th I think... and they asked me if I wanted to help name them. They've chosen not to find out the genders, so they won't know what they're having until the day comes. They would like to name them either all after places or all uni first names, with common but uncommonly spelt or earthy middle names. They also don't want their names to sound too matching to each others' names. Also, if they were to name them all place names, they were thinking of London and Berlin for two of the girl names, and Denver and Oakland for two of the boy names. Thanks in advance for giving me suggestions! And please, don't vote on who's you think is the best answer, as I'd like to pick it myself, so that I can tell you all what they actually ended up having. Thanks!! :)