Well, three things led me to this conclusion:
1) the name of the legal entity has probably no impact whatsoever on the life of NXXX or tmo users, as they won't see it ever (or very few times), hence the debate is moot
2) Paperwork has probably allready begun with the hildon name
3) Aeolus fundation already exists, and Aeolos is already a company, so it's probably not best to use this name, if only it's possible. Hildon is not used by anyone else for any other purpose, probably safer.

hope that makes sense.