I also said [name_u]Augustine[/name_u] as AW-gus-teen when I first saw the name, but when I made an acquaintance with an [name_u]Augustine[/name_u], I learned the correct pronunciation! 
And I feel the same way about [name_f]Elowen[/name_f] too.
Btw, for those interested, I created another accent challenge with names and with words!