Variant spellings with speciality, very foreign like, Common first Male names and forms are given:-
Re:- yces,chc.edu.tw/ engboyname=all =all , which are what you want on spellings on C; K; R only:-
For Caine=C :-Callum, Cameron, Cecil, Charles,=Charlie=Chuck, Chris, Clifford, Clint, Collin, Craig.
For Ke=K:-Keith, Kenneth, Kevin, Kirk, Kit=Christopher, Kyle,
For Rain=R:- Ralph, Randolph=Randolf,=Randy, Raymond, Reece, Rex, Richard=Rick+Richie, Robert, Robin, Roderick, Rodney=Rod, Roger, Ronald,=Ronnie, Roy, Russell, Ryan.
We would suggest the above names.
Simply choose one sounds best to you.