So apparently the WebP format is pronounced as “weppy”. I’ve always pronounced it as “Web pea.” and never heard anyone say “weppy”.
https://web.archive.org/web/20101003121952/http://code.google.com/speed/webp/index.html
This whole thing reminds me of the GIF and JIF debate from a few years back What is it with image formats and weird pronunciations?!
EDIT: Oh, as soon as I posted this I also remembered that it’s supposedly “Ping” for a PNG!
So… we now have Weppy, JIF, and Ping