Was Aragorn fleeing from the law?

[Voralphion]

In terms of the name Wingfoot, it wasn't a name he was ever called by, but the statement by Eomer "I name you Wingfoot" was in fact more of a compliment at their journey on foot, not actually something he was ever called. Also I'm sure that Aragorn probably had many other names that he received on his journeys to far Harad and to the east but they are unknown to us.

And Gandalf is an Istari. So he is not really a man. For all that we know, he could have even more names back in Aman.

I doubt it, as he would've just been called Olorin, his proper name.