[name_m]Welcome[/name_m] to Nameberry!
[name_m]Todd[/name_m] is a lovely name with a lovely meaning. I don’t think he needs to be shortened, but the idea of him as a nn is a fun one! [name_m]Theodore[/name_m] nn [name_m]Todd[/name_m] was my first idea as well, or [name_m]Theoden[/name_m]. Maybe even [name_m]Edmond[/name_m] given he sometimes gets the nn Teddy/Ted/Ned? [name_m]Todd[/name_m] is a stretch, granted, but I do like the idea of [name_m]Edmond[/name_m] nn [name_m]Todd[/name_m].
[name_m]Odilon[/name_m] too, maybe?
Good luck!