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The pronunciation of any word in English (or any language at all) is not Universal.  This is because there are many different dialects of The English Language — both throughout America, and also world-wide.  The pronunciations that are presented on GiveMeSomeEnglish!!! are based-upon a combination of both “common usage”, and the most neutral accent used in The International Common Tongue — a.k.a. “American English”.
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Amadeus – For this name:  the “A” is pronounced like the short letter “o”;  the second “a” turns into a true-schwa;  the “e” is pronounced like the Long “A” / Long “E” Diphthong, there is a phantom consonant “y” in-between the “e” and the “u” (this is a product of the transition from one vowel sound to the next);  then the “u” turns into an i-schwa.

– /ah-mə-DAY-yihs/ – /ɑ.mə.ˈdeiː.jə(ɪ)s/ – Notice also that the stress is on the third syllable –

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Learn More About The Name “Amadeus” On Wiktionary

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