That would only be an issue if they spoke either on Darnassian or Thalassian, and to skirt around that issue they could simply refer as "my people" and "your people". Any potential official communication between groups would be in common so again, not an issue.
That they share a name in their mother tongues when the everyday language of the alliance is common -where their names are different- is a peculiarity at best that would bear little issue.
I mean it's okay if you do, but I have already told you why I think it's not important and so has Tanaria.