I think [name_m]Ridge[/name_m] Kuhn is fine! And even cool. I wouldn’t worry too much about the single syllables. They’re more common than you think.
As for middles, maybe a simple [name_m]Ridge[/name_m] [name_m]Alexander[/name_m]? [name_u]Or[/name_u] you could choose a nice family name. I agree, it should be longer than 1 syllable to balance the name, but even a simple two syllable name would work, like [name_m]Ridge[/name_m] [name_m]Thomas[/name_m] Kuhn.
[name_m]Ridge[/name_m] [name_u]Henry[/name_u], [name_m]Ridge[/name_m] [name_u]Taylor[/name_u]
[name_m]Ridge[/name_m] [name_m]Theodore[/name_m], [name_m]Ridge[/name_m] [name_m]Dominic[/name_m], [name_m]Ridge[/name_m] [name_u]Mackenzie[/name_u]
[name_m]Ridge[/name_m] [name_u]Montgomery[/name_u],
Siblings for [name_m]Ridge[/name_m] -
[name_f]Lena[/name_f], [name_f]Eva[/name_f], [name_f]Georgia[/name_f], [name_f]Iris[/name_f], [name_u]Ever[/name_u], [name_f]Zadie[/name_f],
[name_f]Stella[/name_f], [name_f]Faye[/name_f], [name_f]Lucia[/name_f], [name_u]Hazel[/name_u], [name_f]Cosima[/name_f]
[name_m]Isaac[/name_m], [name_u]Jasper[/name_u], [name_u]Hayes[/name_u], [name_u]Ellis[/name_u], [name_u]Wyatt[/name_u]
[name_m]Dashiell[/name_m], [name_u]Auden[/name_u], [name_u]Henry[/name_u], [name_u]Wilder[/name_u]