We have an [name]Addison[/name] [name]Renee[/name] and [name]Delaney[/name] [name]Marie[/name] and are welcoming a boy in [name]November[/name]… Liking [name]Grayson[/name], [name]Graham[/name], [name]Beckham[/name], [name]Spencer[/name] (kind of) and [name]Finn[/name] as a nickname… wondering what longer names could be shortened to [name]Finn[/name] besides [name]Finnegan[/name] and [name]Finley[/name]… [name]Happy[/name] to hear other suggestions (again) too… Oh, and middle name will be [name]Wesley[/name]. Thanks for your help!!
[name]Phineas[/name] nn [name]Finn[/name]. or maybe [name]Bennet[/name] or [name]Becket[/name]. [name]Anderson[/name]. [name]Harrison[/name]. just to throw something out there.
I personal like [name]Phineas[/name] if you like the nn [name]Finn[/name]. 
I love [name]Graham[/name]! And I think it fits in really well with your girls
Hmmmm. I haven’t got any help for [name]Finn[/name]. Some names I think you might like are:
[name]Beckett[/name]
[name]Carlisle[/name]
[name]Grantham[/name]
[name]Redmond[/name]
[name]Roland[/name]
[name]Vaughn[/name]
Best of luck! I love your girls names =)
[name]Finnian[/name], [name]Thorfin[/name], [name]Ruffin[/name], and [name]Griffin[/name] all could have the nn [name]Finn[/name]. I don’t know if these suit your style but as many possibilities as you can find sounds good.
My favorite of your shortlist is [name]Graham[/name], which works nicely with your girls’ names.
For [name]Fin[/name]:
[name]Finnegan[/name]
[name]Fionn[/name]
Finlan
Finnion
[name]Finnbarr[/name]
I like [name]Graham[/name] [name]Wesley[/name] best with your daughters’ names. Good luck.
I love [name]Griffin[/name] nn [name]Fin[/name]/[name]Finn[/name]. Another is [name]Fintan[/name]. I like [name]Finnegan[/name] or [name]Graham[/name] best with sibs though.
I like [name]Graham[/name] from you list! 
[name]Finnegan[/name] “[name]Finn[/name]” [name]Wesley[/name] would be your best bet.