Say it like "KAH leh". In the Hawaiian language you pronounce all the vowels, therefore no one will associate Kale with the leafy green vegetable, which actually isn't so bad because it's tasty. And Carrot Top is a comedian, though it's not his given name. Kale pronounced without saying the end vowel could be a pet name for Michael.
I found that Kale is the northern English form of Cole. I find the name quite interesting in it's form, and the ways it is portrayed by other people, like it being seen as a vegetable, which Kale is a vegetable, but still.