Swedish names and pronunciation

We haven't encountered that many bizar names... I think the strangest one around here is 'Per'. There's also a Kennert (but they pronounce it Kenneth anyway!). What I really want to talk about today is the strange manner in which Swedish people pronounce their names. Sometimes so different from the spelling that there's not even the slightest bit of the name recognisable.
So, you've got the simple things like vowels changing in pronunciation, which is quite common, because it also happens in English or French. In that fashion the a is pronounced as a double o. So David becomes Doovid en Jan Joon.
Stranger though, and I cannot imagine what the rule is behind this, the pronounce Per as Pelle. And now the really amazing part: there's this guy Gert and they say Jek to him. Seriously...