The spelling of Eugene Lam is determined by its phonetic pronunciation. In IPA phonetic transcription, the word is spelled as juːˈdʒiːn lɑm. The first syllable "ju-" is pronounced as "yoo", while the second syllable "-gene" is pronounced as "jeen". The surname "Lam" is spelled with a silent "b" and is pronounced as "lahm". Therefore, the correct spelling of Eugene Lam is crucial to ensure accurate communication and representation of the name.