[name_m]Hi[/name_m] there.
So, how close is this cousin? [name_f]My[/name_f] dh has…I think…26 first cousins. Some of them we hang out w/and are cool. Some we see once a year & they’re fine. Some are kind of not super nice people & we see extremely rarely. With so many cousins & so many cousins having kids, a lot of names are used. I decided that if a name is used by one of the cousins that we see at most once a year, I wouldn’t let that stop me from using it. Especially if it was a name that I loved as much as you seem to love [name_f]Marnie[/name_f].
That all being said, here are my thoughts on the rest of your list-
[name_f]Averie[/name_f]-I don’t care for this. [name_u]Avery[/name_u] is charming for a boy, & it’s been kind of over used & trendy for a girl in my opinion.
[name_f]Amelie[/name_f]-Ooh, lovely! A similar sound as [name_f]Averie[/name_f], but a way more feminine & elegant feeling. [name_f]Amelie[/name_f] [name_f]Diana[/name_f] or [name_f]Amelie[/name_f] [name_f]Elizabeth[/name_f] would be gorgeous.
[name_f]Belle[/name_f]-I kind of like this more as a nn, but it’s a pleasant name. [name_f]Belle[/name_f] [name_f]Diana[/name_f] would be pretty.
[name_f]Erin[/name_f]-Not my super favorite, but it’s not bad at all. [name_f]Erin[/name_f] [name_f]Elizabeth[/name_f] sounds great.
[name_f]Faye[/name_f]-Same as above. [name_f]Faye[/name_f] [name_f]Elizabeth[/name_f] or [name_f]Faye[/name_f] [name_f]Diana[/name_f]. I kind of like [name_f]Faye[/name_f] [name_f]Diana[/name_f] actually, even though neither of those names are my cup of tea. Something pixie-ish about it!
[name_f]Leah[/name_f]-A sweet simple classic. I like [name_f]Leah[/name_f] [name_f]Diana[/name_f] or [name_f]Leah[/name_f] [name_f]Elizabeth[/name_f].
[name_f]Lucie[/name_f]-I prefer [name_f]Lucy[/name_f], but it’s a darling name. [name_f]Lucie[/name_f] [name_u]Anne[/name_u] or [name_f]Lucie[/name_f] [name_f]Diana[/name_f] are beautiful.
[name_f]Mae[/name_f]-Another great choice! I’m really no help, am I? [name_f]Mae[/name_f] [name_f]Elizabeth[/name_f] is adorable.
And of course [name_f]Elizabeth[/name_f] on its own is a perfect choice for a fn. I love [name_f]Bess[/name_f] too. Also, [name_f]Tess[/name_f]!
[name_f]Hope[/name_f] this helps. 