The franchise as a whole is very Italian influenced. With names like Nero, Dante, Vergil, Enzo, Machiavelli, Nicoletta, and all of Fortuna and if its not then its English/British. I doubt they'll deviate from this naming convention especially for "NERO's" (literally Italian for black) mom.
I too vote for a name that is a shade of red. Since in DMC characters tend to be color coded. Dante is red, Vergil blue (now black with some blue), V is black, Trish is yellow, DMC4SE sort of associated Lady with pink but many can associate her with white (since white is pure like the Virgin Mary), Lucia......also white apparently but she doesn't really matter at the moment, Sparda purple, and Nero in 4 was blue and red but now is mostly rocking blue as this seems as indication of him taking up Vergil's role/legacy. With Dante potentially gone from the story (if Capcom has any balls) we will need a new red character to take that spot.
Nero's mom was seen wearing red....know who also is known to wear red.
And this is the DMCverse where characters seem to have slight Oedipus complex. Would not be surprised if Nero's mom bears some similarities to Eva (not like Trish maybe just some coincidences/similarities that Vergil notices...she doesn't have to be a blonde too).