[name_m]August[/name_m] is such a wonderful choice! Congratulations!
I think you’ve got some great options and most don’t feel too much imo! [name_m]August[/name_m] [name_m]Willoughby[/name_m] is my favourite - rugged, but friendly, free-spirited but with a touch of cosiness.
I also like [name_m]August[/name_m] [name_m]Wilde[/name_m], [name_m]August[/name_m] [name_m]Jacoby[/name_m], [name_m]August[/name_m] [name_m]Boone[/name_m] and [name_m]August[/name_m] [name_m]Reeve[/name_m] 
A few more ideas:
[name_m]August[/name_m] [name_m]Roscoe[/name_m]
[name_m]August[/name_m] [name_m]Barnaby[/name_m]
[name_m]August[/name_m] [name_m]Caspian[/name_m]
[name_m]August[/name_m] [name_m]Orion[/name_m]
[name_m]August[/name_m] [name_m]Sol[/name_m]
[name_m]August[/name_m] [name_m]Bramwell[/name_m]
[name_m]August[/name_m] [name_m]Sylvan[/name_m]
[name_m]August[/name_m] [name_m]Remy[/name_m]
[name_m]August[/name_m] [name_m]Rafferty[/name_m]
[name_m]August[/name_m] [name_m]Leander[/name_m]
[name_m]August[/name_m] [name_m]Oleander[/name_m]
[name_m]August[/name_m] [name_m]Rivers[/name_m]