GPS doesn't like Welsh

on our way to a certain pub in Cardiff that we didn't know the location to, we turned on the GPS to make sure we were going in the right direction. suddenly, the voice instructed us to turn left onto T-Y-N-Y Parkway. at first, i thought there was a new acronym i didn't know about but in fact, the GPS clearly didn't know how to pronounce Welsh. admittedly, that would sound very much like 'toonoo', but it's a bit odd that while a GPS can speak tons of languages (my father likes his instructions to be in Danish), they haven't figured out a way for it to speak Welsh...