Interesting - I would have gone with "Doo Doo", but I don't think there are standard English phonetic rules for this particular name. Mentally though knowing that it has French origins, I think I just compared it to other French words I know with "ou" when written out in english.

How would you have pronounced "loulou"? Not like the name, "Lou," twice?

As a native English speaker, I would pronounce "Doudou" the same as I'd pronounce "Loulou" -- "Doo doo" and "Loo loo" respectively.

lou, though, through