So sorry you’re having name struggles 
I, personally, think [name_m]Ru[/name_m] is adorable! The [name_f]Winnie[/name_f] the Pooh character didn’t even cross my mind!
[name_f][/name_f]If you don’t like [name_f]Ruby[/name_f] or [name_f]Ruthie[/name_f], perhaps a ‘ro’ starting name would work? Like [name_f]Rosalie[/name_f] or maybe even [name_f]Ramona[/name_f]?
[name_f][/name_f]Other suggestions:
[name_f][/name_f][name_f]Rosemary[/name_f], [name_f]Romilly[/name_f], Prudence, True/Truly, [name_m]Rowan[/name_m], [name_m]Drew[/name_m], [name_f]Gert[/name_f]rude, [name_f]Larue[/name_f] (kinda sounds like Lou?)
[name_f][/name_f]Good luck!