This is the sweetest description of a boy’s name ever. 
I’m always here for advice, I’m rubbish at providing any new suggestions. But [name_m]Hollier[/name_m] and [name_m]Ridge[/name_m] were two names I saw recently that sort of give me mountain hymn vibes. I don’t know that [name_m]Ridge[/name_m] [name_m]Hollier[/name_m] or [name_m]Hollier[/name_m] [name_m]Ridge[/name_m] actually fits the flow of the rest of your list, but they feel mountainous to me. [name_m]Walden[/name_m], [name_m]Forge[/name_m] and [name_m]Alabaster[/name_m] do as well but are all very different.
I follow someone on Instagram who has a son named Sower [name_m]Wells[/name_m] and my husband would never let me use it because it would get confused with Sewing like a seamstress, but I loved the Biblical meaning behind why they chose it.