The kids and I came up with a bunch of ideas 
I’ll list them below. Feel free to throw out more combo ideas based on these names. Names in parentheses are second middle options.
Nash Wesley (Forest/Charles/Oak)
Nash Rafferty (Fields)
Nash Redmond (Oak/Charles/Sawyer)
Nash Sawyer (Fields)
Nash Forrest
Nash Fielding
[name_m]Nash[/name_m] [name_m]Rafferty[/name_m] is my favourite from your list, it’s charming.
Some other ideas, hope it helps 
[name_m]Nash[/name_m] [name_m]Fraser[/name_m] (men who belong in forest)
[name_m]Nash[/name_m] [name_m]Foster[/name_m] (guardian of the forest)
[name_m]Nash[/name_m] [name_m]Elwood[/name_m] (noble woods)
[name_m]Nash[/name_m] [name_f]Arden[/name_f] (great forest)
[name_m]Nash[/name_m] [name_m]Linwood[/name_m] (stream in forest)
[name_m]Nash[/name_m] [name_m]Alder[/name_m] (alder tree)
[name_m]Nash[/name_m] [name_m]Oswald[/name_m] (god of forest)
[name_m]Nash[/name_m] Marwood (lake forest)
[name_m]Nash[/name_m] [name_m]Silas[/name_m] (God of the forest)
[name_m]Nash[/name_m] Codrin (forest)
[name_m]Nash[/name_m] [name_m]Xylon[/name_m] (woodland dweller)
[name_m]Nash[/name_m] [name_m]Sherwood[/name_m] (bright forest)
[name_m]Nash[/name_m] [name_m]Wesley[/name_m] [name_m]Forest[/name_m] is so warm, rugged and charming!
[name_m]Nash[/name_m] [name_m]Rafferty[/name_m] is beautiful - springy and delightful and fun. Not sure on the flow of [name_m]Fields[/name_m] at the end, but the more I say it, I think it’s growing on me - something playful and cool at the same time.
[name_m]Nash[/name_m] [name_m]Redmond[/name_m] is wonderfully charming; preppy but outdoorsy too. [name_m]Nash[/name_m] [name_m]Redmond[/name_m] [name_m]Sawyer[/name_m] is my favourite as it feel like it fits that vibe
[name_m]Nash[/name_m] [name_m]Forrest[/name_m] - autumnal vibes - shades of orange, rich browns and reds.
Playing about with your ideas:
[name_m]Nash[/name_m] [name_m]Rafferty[/name_m] [name_m]Sawyer[/name_m]
[name_m]Nash[/name_m] [name_m]Rafferty[/name_m] [name_m]Charles[/name_m]
[name_m]Nash[/name_m] [name_m]Forrest[/name_m] [name_m]Wesley[/name_m]
Throwing in a few suggestions:
[name_m]Nash[/name_m] [name_m]Wesley[/name_m] [name_m]Orson[/name_m]
[name_m]Nash[/name_m] [name_m]Rafferty[/name_m] [name_m]Gage[/name_m]
[name_m]Nash[/name_m] [name_m]Redmond[/name_m] [name_f]Fifer[/name_f]
[name_m]Nash[/name_m] [name_m]Sawyer[/name_m] [name_m]Lorcan[/name_m]
[name_m]Nash[/name_m] [name_f]Marlowe[/name_f] [name_m]Forrest[/name_m]
[name_m]Nash[/name_m] [name_m]Redmond[/name_m] [name_m]Oakley[/name_m]
[name_m]Nash[/name_m] [name_m]Sawyer[/name_m] [name_m]Fox[/name_m]
[name_m]Nash[/name_m] [name_m]Rafferty[/name_m] [name_f]Bryn[/name_f]
[name_m]Nash[/name_m] [name_m]Callahan[/name_m] Wyeth
[name_m]Nash[/name_m] [name_m]Percival[/name_m] [name_m]Oakley[/name_m]
[name_m]Nash[/name_m] [name_m]Peregrine[/name_m] [name_m]Archie[/name_m]
[name_m]Nash[/name_m] [name_f]Kimber[/name_f] [name_m]Fields[/name_m]
[name_m]Nash[/name_m] [name_m]Riordan[/name_m] [name_m]Sawyer[/name_m]
[name_m]Nash[/name_m] [name_m]Keegan[/name_m] [name_m]Wesley[/name_m]
[name_m]Nash[/name_m] is such a cool name! Are the names in parenthesis the meanings of the names or a second middle name you’d add on to the end?
[name_m]Nash[/name_m] [name_m]Rafferty[/name_m] and [name_m]Nash[/name_m] [name_m]Wesley[/name_m] both sound really cool to me
Other ideas…
[name_m]Nash[/name_m] [name_m]Lincoln[/name_m]
[name_m]Nash[/name_m] [name_m]Timothy[/name_m]
[name_m]Nash[/name_m] [name_m]River[/name_m]
[name_m]Nash[/name_m] [name_m]Elias[/name_m]
[name_m]Nash[/name_m] [name_m]Jayden[/name_m]
[name_m]Nash[/name_m] [name_m]Hawthorne[/name_m]
[name_m]Nash[/name_m] [name_m]Prescott[/name_m]
[name_m]Nash[/name_m] [name_m]Anderson[/name_m]
[name_m]Nash[/name_m] [name_m]Jameson[/name_m]
[name_m]Nash[/name_m] [name_m]Keaton[/name_m]
[name_m]Nash[/name_m] [name_f]Scottie[/name_f]
[name_m]Nash[/name_m] [name_m]Everest[/name_m]
[name_m]Nash[/name_m] [name_f]Lux[/name_f]
[name_f]My[/name_f] favourite is [name_m]Nash[/name_m] [name_m]Sawyer[/name_m]!
[name_m]Nash[/name_m] is short so you really hear the short a- sound and -sh sound.
Since you have multiple choices, you could fine tune it by not repeating those sounds, leaving out [name_m]Wesley[/name_m], [name_m]Rafferty[/name_m], [name_m]Forrest[/name_m], and [name_m]Sawyer[/name_m].
[name_m]Nash[/name_m] [name_m]Redmond[/name_m] and [name_m]Nash[/name_m] [name_m]Fielding[/name_m] are awesome!
[name_m]Nash[/name_m] [name_m]Redmond[/name_m] [name_m]Charles[/name_m] or [name_m]Oak[/name_m] OR [name_m]Nash[/name_m] [name_m]Fielding[/name_m] [name_m]Charles[/name_m] or [name_m]Oak[/name_m] is great.
[name_m]Nash[/name_m] [name_m]Alden[/name_m] [name_m]Fields[/name_m], [name_m]Nash[/name_m] [name_m]Corbin[/name_m] [name_m]Oak[/name_m], [name_m]Nash[/name_m] [name_m]Riordan[/name_m] [name_m]Charles[/name_m], [name_m]Nash[/name_m] [name_m]Mitchell[/name_m] [name_m]Fields[/name_m], [name_m]Nash[/name_m] [name_m]Fielder[/name_m], [name_m]Nash[/name_m] [name_m]Lawrence[/name_m], [name_m]Nash[/name_m] [name_m]Tolliver[/name_m], [name_m]Nash[/name_m] [name_m]Calder[/name_m], [name_m]Nash[/name_m] Kellar
[name_m]Nash[/name_m] wouldn’t generally be my thing but I love almost all your combos! I think [name_m]Nash[/name_m] [name_m]Rafferty[/name_m] is my favorite, followed by [name_m]Nash[/name_m] [name_m]Redmond[/name_m], then [name_m]Nash[/name_m] [name_m]Fielding[/name_m] (big [name_m]Fielding[/name_m] fan!). Maybe something like [name_m]Nash[/name_m] [name_m]Montgomery[/name_m] or [name_m]Nash[/name_m] [name_m]Sinclair[/name_m] or [name_m]Nash[/name_m] [name_m]Oberon[/name_m]?
Good luck!
[name_m]Nash[/name_m] [name_m]Oakley[/name_m]
Thank you! Your suggestions are spot on~ big brother’s middle is [name_m]Montgomery[/name_m]