That seems like an excellent reason to use a different name, if you have one on hand. Avoids confusion.
Alright, some of you may know me as a fervent opponent of army-summoning Noble Phantasms. "It's been done, come up with your own idea" has been my general stance on things, with a side order of "just because he's a famous general doesn't mean his army is his Noble Phantasm."
How much of a hypocrite would I be if I let Julius Caesar summon his army?