I feel like it’s going to be a religious/spiritual word name. [name_f]Sunday[/name_f] and [name_m]Shepherd[/name_m] are really good guesses I could definitely see them using those.
Other guesses:
[name_f]Bliss[/name_f] or [name_m]Bless[/name_m]
[name_f]Soul[/name_f]
[name_f]Praise[/name_f]
Armor
[name_m]Champion[/name_m]
[name_f]Verity[/name_f]
[name_m]Worth[/name_m]
[name_f]Solace[/name_f]
[name_m]Arrow[/name_m]
[name_m]Peace[/name_m]
[name_m]Brave[/name_m]
[name_f]Glory[/name_f]
Maybe even [name_f]Hallelujah[/name_f]?