Köln,that is the roman colony for ubi nation might have first founded by the latter
related to ubina tribe of aimara.
Also the language of Nubian barabra may distantly be related to that of the aimara although aimara tribe in Eritrea is now joint to kunama, how I understand,also present in Bolivia .
Colonia name therefore in this case might have come from Colla and Collahua ethnonyms of aimaras .
See Nairobi,Przybinski,La Paz,Weimar,Ótott,Kamenek,Andok,Peru,Dortmund and more !