German · Pronunciation Guide
HY-sn. A breathed h, the 'eye' diphthong, and the ß as a plain hissing s.
The beat rides the diphthong, which holds nearly all of the word's duration. The conjugated forms pile consonants onto the end without adding weight: du heißt has ß and t back to back, which is a cluster worth slowing down for before you can say it at speed.
Listen: heißen
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Wie heißt du?
What's your name?
Listen: Wie heißt du?
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Wie heißt du? is literally 'how are you called', which is why the question word is wie and not was. German treats a name as something you are called rather than something you have, and the whole phrase is best memorised as a unit rather than assembled from English.
The ß gets misread as a B, and the ei gets read as 'ee' — the two commonest German spelling errors landing in one four-letter word. It is 'HY-sn'. Then there is the idiom: learners produce was ist dein Name, which is understandable but stiff, where a German would ask wie heißt du without hesitation.