A couple of ideas -some may be a bit more of a stretch/bold
[name_u]David[/name_u] - Daffyd, [name_m]Davey[/name_m], [name_u]Devin[/name_u], [name_m]Ovid[/name_m]
[name_u]Shawn[/name_u] -Shane, [name_m]Seamus[/name_m], [name_u]Shay[/name_u], [name_m]Sholto[/name_m]
[name_u]Arthur[/name_u] - [name_m]Artan[/name_m], [name_m]Bear[/name_m], [name_u]Artie[/name_u], [name_m]Art[/name_m], [name_u]Arlo[/name_u], [name_m]Orson[/name_m], [name_u]Kingsley[/name_u]
[name_u]William[/name_u] -Wilkie, [name_m]Wilson[/name_m], [name_m]Wilbur[/name_m], [name_m]Wilbert[/name_m], [name_u]Willow[/name_u], [name_m]Wilhelm[/name_m]
[name_m]Zachary[/name_m] -Ari, [name_m]Zacharias[/name_m], [name_u]Cary[/name_u]
[name_m]Trevor[/name_m] - [name_u]Ever[/name_u], [name_m]Ivor[/name_m], [name_m]Travis[/name_m], [name_u]Reeve[/name_u]
Luke-Lucian, [name_u]Luca[/name_u], [name_m]Louis[/name_m], [name_m]Llewellyn[/name_m], [name_u]Louie[/name_u], [name_m]Lucan[/name_m]
[name_m]Ciro[/name_m] - [name_m]Carlo[/name_m], [name_u]Cairo[/name_u], [name_m]Cyrus[/name_m], [name_m]Sirius[/name_m], Ro/Rowan
[name_m]Felix[/name_m]- [name_u]Fox[/name_u], [name_m]Felicio[/name_m], [name_m]Frederick[/name_m], Alex/Alix
[name_u]Tyler[/name_u] - [name_u]Taylor[/name_u], [name_u]Tyson[/name_u], [name_u]Tay[/name_u], Tadhg/Tyge, [name_u]Kyler[/name_u]