I know a [name_m]Lyndon[/name_m] who is a great guy! I do see both spellings as more masculine but I think it can work either way.
Of your combos I like [name_u]Linden[/name_u] [name_f]Amelia[/name_f], [name_u]Linden[/name_u] [name_m]Patrick[/name_m], and [name_u]Linden[/name_u] [name_u]Everett[/name_u] the most.
Other suggestions:
[name_u]Linden[/name_u] [name_f]Audrey[/name_f]
[name_u]Linden[/name_u] [name_f]Briar[/name_f]
[name_u]Linden[/name_u] [name_m]Gabriel[/name_m]
[name_u]Linden[/name_u] [name_f]Rose[/name_f]
[name_u]Linden[/name_u] [name_m]Maxwell[/name_m]