The correct spelling of the name "Heindrik" may vary depending on the language it is pronounced in. In English, the "ei" sound is typically pronounced as "ay" as in "day" while the "k" at the end is pronounced as "k" as in "kite". Therefore, the IPA transcription for Heindrik would be /ˈheɪndrɪk/. However, in other languages such as Dutch or Afrikaans, the pronunciation may vary slightly, and the spelling may be different as well.