Why do Vulcans call themselves after something from Earth mythology?
And there's Romulus and Remus?
Who says they do?
That's what humans call them and what federation translator software has been programmed to call them...
just like Klingon's in their native language are called the Tlh'Ingan (According to Memory Alpha anyway)... humans just call them Klingons and the universal translator translates the names other species call them to Klingon...
For all we know the Vulcan's might call themselves the Toblerones... and Romulans call themselves the Drow lmao
M