j.c.
jc
j-c
j_c

Because same artist:

URL http://www.furaffinity.net/user/jc/
URL http://www.pixiv.net/member.php?id=1476775
URL http://jcdump.com/
URL http://j-c.deviantart.com/
URL http://us.vclart.net/vcl/Artists/J-C/