A male cousin ('cousin sister' = a female cousin).
My cousin brother from Kochi is staying with us.
Cousin
Your uncle's or aunt's child, boy or girl.
My cousin from Kochi is staying with us. He loves cricket.
Remember: Many Indian languages call cousins brother and sister, so the English follows. With international listeners, just say 'cousin' and let 'he' or 'she' show which.