Both pronunciations are probably correct. It depends on what country you're from and what part of that country you're in.
For example: in the US, people pronounce things differently in the North than they do in the South. They also pronounce things differently in New York than in Michigan.
Northerners say: You all and Southerners say Y'all. Northerners say Crayfish, Southerners say Crawfish.
White people pronounce things differently than black and Hispanic people. Asian people pronounce things differently to.
If someone comes to the US from France or Germany, they might still be in the habit of pronouncing the letter W like we pronounce the letter V in English, because in those languages, that is how the letter W is pronounced.
In the US, we say things differently than people do in Canada, people in Australia pronounce things differently than Canadians and British people pronounce things even differently than the other countries.
So both pronunciations are probably correct.