Megaera is basically a description of Meghan Markle and anyone who looks up the Greek myths will just see Furiae and associate your child with Furries. I’d avoid it.
In many European languages, cognates of this name are used as a term for a shrewish woman. In Italian and Portuguese the word is megera, in French it's mégère. I think it's a terrible thing to saddle a child with. [noted -ed]
The other two Erinyes of Greek mythology were Alecto and Tisiphone. The Romans called them the Furiae. The Furiae/Erinyes would mete out justice in whatever way they saw fit, usually killing the wrongdoer, no matter how relatively insignificant his transgression.