The spelling of the word "Hertlein" is based on its German ancestry. In IPA phonetic transcription, it is pronounced as "/ˈhɛɐtlaɪn/". The "H" is silent, while the "e" and "r" are combined to make an "er" sound. The "t" is pronounced as "t", and the "l" is pronounced as "l". The "ei" in the word is pronounced as "ai", and the final "n" is pronounced as "n". Understanding the phonetic transcription of "Hertlein" can help with accurate pronunciation and spelling.