The spelling of the word "Ostein" can be a bit tricky, as it is not a commonly used word. The phonetic transcription of this word is [oʊ.stiːn]. The first syllable "oʊ" is pronounced like the "o" in "go" and the "u" in "put" combined. The second syllable "stiːn" is pronounced with a long "i" sound followed by "n". To spell it out, use "o" followed by "s", "t", "e", "i", and "n". The word "Ostein" has no known meaning.