I think a lot of it comes down to the way kids are taught to read at school, by sounding things out, when the English language can have one seplling with tons or pronunciations (ough is a classic - through, though, thought, tough, plough, thorough, hiccough)

DaintreeDream - one of the kinder teachers where DS will hopefully go next year is Rachelle pronounced Rachael.
Lulu i reckon youd have heard a few pearlers in the call centre.
My Aunty works for centrelink in Pensions and so from time to tme I hear some rippers like

Elspeth - el-SER-peth
Danielle - Dun-EEL
Karen - Kaaren

And I worked with someone whose name was spelled Bahriye, and pronounced Bree-uh