Wesley

My son's name is Wesley. I live in the States (Texas to be exact) and I'd say the pronunciation is 50/50 WEZ-lee and WES-lee. I say WES-lee and call him Wes quite often.

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I had no idea the WEZ-lee pronunciation was so common when we named him as it's a family name in both mine and my husband's family and we'd only ever heard it said "WES-lee" except maybe on tv.

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So, there doesn't even seem to be a regional difference in the pronunciation. Not one that I can find anyway. Everywhere we go it's still about 50/50 of people saying "Wes" or "Wez".
It may partially be a generational thing as it seems that people that are my parents' age or older are more likely to say "Wez-lee" and people around my age or younger tend to say "Wes-ley". If there is a generational difference, at least in the cities I frequently visit in Texas, it is only a slight one.

I'm an American, and I've only ever heard it pronounced "Wez-Lee."

Most people pronounce it WEZ-ly; only Americans say WESS-ly.