Yeah thats how you say it at least thats how I say never heard anything other wise but while looking for a Cantonese translation where I found the english pronunciation which was similar too yours if I remember right was "kahm fa" I also found this old interesting thread on king kamfa that has the exact flowerhorn that was used and edited to make the famous picture of the cuban with a flowerhorn shape
http://flowerhornrusforum.com/topic/106806/1/
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