[name_m]Matty[/name_m] is my favorite from your options, though I think [name_f]Marty[/name_f] is most intuitive.
[name_f][/name_f]I would probably go with [name_f]Marnee[/name_f], taking the N and the two Es from [name_f]Eleanor[/name_f]. [name_f]Or[/name_f] [name_f]Marlee[/name_f]! I like that better. [name_f]Or[/name_f] MARLO! I CHOOSE MARLO!