From what I've read/heard, Kahn-ay is the most proper but con-yay is acceptable depending on who's saying it in what accent. I'm not an expert but I do believe it is a bit variable.
"Cane", as in "sugar-cane" is also
"acceptable depending on who's saying it in what accent' ...
that still doesn't make it correct.
"acceptable depending on who's saying it in what accent' ...
that still doesn't make it correct.