[name_m]Fenton[/name_m] [name_m]Todd[/name_m] (Fen)
[name_m]Dunstan[/name_m] [name_m]Todd[/name_m] (Stan)
[name_m]Shepherd[/name_m] [name_m]Todd[/name_m] (Shep)
[name_u]Douglas[/name_u] [name_m]Todd[/name_m] (Doug)
[name_m]Harrison[/name_m] [name_m]Todd[/name_m] (Harry)
[name_m]Thompson[/name_m] [name_u]Dawson[/name_u] (Tom)
[name_m]Bramwell[/name_m] [name_m]Todd[/name_m] (Bram or Welby)
[name_m]Edmund[/name_m] [name_m]Todd[/name_m] (Ned)
[name_u]Jonah[/name_u] [name_m]Todd[/name_m] (Joe)
[name_m]Kenelm[/name_m] [name_m]Todd[/name_m] (Elm)
[name_m]Valerian[/name_m] [name_m]Todd[/name_m] (Val or Vale)
[name_m]Winfield[/name_m] [name_u]Dawson[/name_u] (Win or Field)
[name_m]Nicholas[/name_m] [name_m]Todd[/name_m] (Nick)
[name_m]Gordon[/name_m] [name_u]Dawson[/name_u] (Gordy or Orrie)
[name_u]Gardener[/name_u] [name_m]Todd[/name_m] (Den)
I think I like [name_m]Graham[/name_m] best. Might like it better as [name_m]Graham[/name_m] [name_u]Dawson[/name_u].
Other ideas, since you mentioned it:
[name_m]Archie[/name_m]
[name_m]Anders[/name_m]
[name_u]Arthur[/name_u]
[name_u]Bryce[/name_u]
[name_u]Charles[/name_u]
[name_m]Dominic[/name_m]
[name_u]Elliott[/name_u]
[name_m]Eugene[/name_m]
[name_u]Everett[/name_u]
[name_u]Finley[/name_u]
[name_m]Gaines[/name_m]
[name_m]Harvey[/name_m]
[name_u]Henry[/name_u]
[name_m]Oliver[/name_m]
[name_u]Ollie[/name_u]
[name_m]Osker[/name_m]
[name_u]Reid[/name_u]
[name_u]Riley[/name_u]
[name_u]Scott[/name_u]
[name_m]Theodore[/name_m]
[name_m]Tripp[/name_m]
[name_u]Walter[/name_u]
[name_m]Wes[/name_m]
[name_u]William[/name_u]
[name_u]Wyatt[/name_u]
[name_m]Xavier[/name_m]
[name_m]Zach[/name_m]
[name_m]Zachary[/name_m]
I like [name_u]Griffin[/name_u] [name_m]Todd[/name_m], but with no nickname. I would do [name_m]Graham[/name_m] [name_u]Dawson[/name_u] over [name_m]Graham[/name_m] [name_m]Todd[/name_m]. I also wouldn’t use the nickname with [name_m]Graham[/name_m].
Of your suggestions overall I like [name_m]Harrison[/name_m] [name_m]Todd[/name_m] the best but as a sibset with [name_u]Bennett[/name_u] and [name_u]Callahan[/name_u], [name_u]Griffin[/name_u] [name_m]Todd[/name_m] would go best.
What about:
[name_m]Alexander[/name_m] [name_m]Todd[/name_m] (Lex)
[name_u]August[/name_u] [name_u]Dawson[/name_u] (Gus)
[name_m]Damian[/name_m] [name_m]Todd[/name_m] (Ian)
[name_m]Dominic[/name_m] [name_m]Todd[/name_m] (Dom)
[name_u]Elias[/name_u] [name_u]Dawson[/name_u] (Eli)
[name_u]Finnegan[/name_u] [name_m]Todd[/name_m] (Fin)
[name_m]Frederick[/name_m] [name_u]Dawson[/name_u] (Ric)
[name_u]Jackson[/name_u] [name_m]Todd[/name_m] (Jac)
[name_m]Jonas[/name_m] [name_u]Dawson[/name_u] (Jon)
[name_u]Leon[/name_u] [name_m]Todd[/name_m] (Leo)
[name_m]Louis[/name_m] [name_u]Dawson[/name_u] (Lou)
[name_m]Malachi[/name_m] [name_u]Dawson[/name_u] (Mal)
[name_u]Maxwell[/name_u] [name_u]Dawson[/name_u] (Max)
[name_m]Nicholas[/name_m] [name_u]Dawson[/name_u] (Nic)
[name_m]Oliver[/name_m] [name_m]Todd[/name_m] (Oli)
[name_m]Otis[/name_m] [name_u]Dawson[/name_u] (Oti)
[name_m]Patrick[/name_m] [name_u]Dawson[/name_u] (Pat)
[name_m]Rafferty[/name_m] [name_u]Dawson[/name_u] (Raf)
[name_m]Russell[/name_m] [name_m]Todd[/name_m] (Rus)
[name_m]Samuel[/name_m] [name_u]Dawson[/name_u] (Sam)
[name_u]Sullivan[/name_u] [name_m]Todd[/name_m] (Van)
[name_u]Thaddeus[/name_u] [name_u]Dawson[/name_u] (Tad)
[name_u]Wesley[/name_u] [name_u]Dawson[/name_u] (Wes)
[name_u]Wilson[/name_u] [name_m]Todd[/name_m] (Wil)
[name_m]Zachary[/name_m] [name_u]Dawson[/name_u] (Zac)
I absolutely love Graham and I like Harrison. I really don’t like Todd tho, it reminds me the word toddler, but perhaps it’s an honour name. I hope I didn’t offend you! 
I’m also thinking
Caradoc
Arcturus
Caius
Carlisle
Cormac
Ambrose
Alistair / Alastor / Alasdair
Congratulations! I love your boys names!! [name_u]Miles[/name_u], [name_u]Griffin[/name_u] and [name_m]Harrison[/name_m] are all amazing! These combos are my favourites:
[name_m]Harrison[/name_m] [name_m]Todd[/name_m]
[name_u]Griffin[/name_u] [name_m]Todd[/name_m]
[name_u]Miles[/name_u] [name_u]Dawson[/name_u]
Some suggestions:
[name_m]Desmond[/name_m] [name_m]Todd[/name_m] (Des)
[name_m]Malcolm[/name_m] [name_m]Todd[/name_m] (Mal…though [name_u]Cal[/name_u] and [name_u]Mal[/name_u] doesn’t work hmmm)
[name_u]Lawrence[/name_u] [name_u]Dawson[/name_u] (Laws)
[name_u]Dawson[/name_u] [name_m]Todd[/name_m] (have you considered this?)
[name_m]Edmond[/name_m] [name_m]Todd[/name_m] (Ed/Eddie)
[name_m]Victor[/name_m] [name_m]Todd[/name_m] (Vic)
[name_u]Davis[/name_u] [name_m]Todd[/name_m]