What is the name of the ɔʏ sound?
What's the English name of the oi sound written as "eu" and commonly found in Germanic words like Deutschland, and names like Euler and von Neumann?
There's no single word for it. It’s the diphthong /ɔɪ/, a glide which ‘begins between back half-open and open positions, moves upwards and forwards towards [ɪ]; lips open rounded changing to neutral’ (‘Cambridge Encyclopedia of the English Language’).