I'm finnish. But it's hard to explain in writing how to pronounce it. Maybe if we split the word like this:
Ki-e-lo
The finnish 'i' sounds like the english 'e'. Therefore, the first bit would sound like english 'Ke'. The finnish e-sound is similar to 'e' in '
Emma'. So try putting those sounds after another to form 'Kie'. 'lo' on the other hand is quite simple - sounds like 'loh'.
edit - found a nice link, pronounciation for finnish names.
Kielo was not listed, but a similar one 'Mieto':
sci.fi/~kajun/finns/Samples/mieto.wav