rib
retina
rectum
renal gland
Can't think of any more.
These are all general "parts", not exclusively "boy parts."
Root (crus) is the only part of the male penile anatomy that begin with the letter "R".
Male names that begin with the letter R:
Ralph, Ramon, Randy, Raymond, Regan, Reginald, Rene, Ricardo, Richard, Ricky, Robert, Rodney, Roger, Roland, Roman, Rory, Ross, Roy, Rudolph and Ryan are boy names. They begin with the letter r.
Radaah
rob
robenson
rory
rollins
roddy
radem
robby
robin
Ryan, Robbert, Roger, Rolly, Reden, Rex, Randy, Roman, Richard, Rick, Remy, Renold, Ross, Russell, Redding, Ron, Rupert
# Roger # Ron # Rob # Robbert # Rable
russle,rj
A boys name beginning with H is Harris
Quinn
The name of a full turn, beginning with the letter "r", would probably be rotation.
A male name that starts with a U is Uriah.
Zymeer Zachariah
boys-AdamAidenAlecgirls-AmyAmandaAbby
# Larry # Landon # Logan
Ian- a Scottish name Idris - a Welsh name Isidore - a rare name
roe
Rani
Raspberry sauce.
hansbrough Hampton Hamlton