"Donnedieu" is a surname of French origin, pronounced as "dɔnədjø". The first syllable is stressed and pronounced as "dɔn", followed by a schwa sound in the second syllable representing the French "-e" at the end of the word. The third syllable is pronounced as "djø", with a combination of the French "d" and "j" sounds, and the rounded front vowel "ø". The spelling of "donnedieu" follows the common French pattern of using silent letters and non-phonetic spellings.
There is no information available about the etymology of the word "donnedieu". It seems that "donnedieu" is not an established word or term in any language. It could be a surname or a fictional word without a clear etymology.