I agree with @Greyblue[name_f][/name_f] that [name_m]Max[/name_m] and [name_m]Mars[/name_m] works but [name_f]Marceline[/name_f] and [name_f]Maxine[/name_f] would be too matchy.
[name_f][/name_f]You’ve already gotten so many great suggestions, here are a few more:
[name_f][/name_f][name_f]Marnie[/name_f]
[name_f][/name_f][name_f]Marissa[/name_f]
[name_f][/name_f][name_f]Marisol[/name_f]
[name_f][/name_f][name_f]Marlene[/name_f]
[name_f][/name_f][name_f]Amaris[/name_f]
[name_f][/name_f][name_f]Maryse[/name_f]
[name_f][/name_f][name_f]Marcie[/name_f]
[name_f][/name_f][name_f]Rosemarie[/name_f]
[name_f][/name_f][name_f]Marcelina[/name_f]
[name_f]Hope[/name_f] this helps!