No, other cultures do not have a name for an extrasolar planet just discovered.

Moreover, the extant names from the Roman pantheon are universal within the international scientific community. They are also nearly exhausted.

I find it tedious to reject names from other pantheons. Not least because they are exceptionally cool - Quaoar and ʻOumuamua are stellar and divine names. Of all things, should not astronomy inspire us to grok human culture as a global and syncretic whole, as opposed to a parochial set of divisions in which English speakers may only use Greco-Roman gods?