Ry-Ry is what I use for my friend named Ryan, and a lot of people seem to use it with their Ryan friends. If its a boyfriend someone sometimes uses R-Bear. Kinda cheesy tho.
Hope this helped ^^
Ryry, Ryn, Ryoul, Rere, or he could just go by his real name... It's not that much to say.
Ryjohn
Ry, Rhino, Ry-Man...
RyRy or ReeRee
Cris
hardy
Luke or Lue
Dan, Danny, Elly.
Pretty Ricky
depends on the guy's qualities, Nabi? Nabif?
L..... just simply L
Davie? Davie? Dave. dav-dav
Jacky, jay-jay, mr. J,
B- Jammin' Benmonster Benji BJ x)
a good nick name for a girl named mariam could be mary but a good nick name for a guy named mariam could be..... mar? i dont really know for a guy, sorry
Andy