As in “See-URL”? I’ve always called it curl but “see url” makes a hell of a lot of sense too! I’ve just never considered it and it’s one of those things you rarely say out loud.

I prefer cURL as well, but according to official sources it is curl. :D Not sure how it is pronounced though, I pronounce it as "see-url" and/or "see-U-R-L". It might be pronounced as "curl" though.