The spelling of "Lannah" can be explained using the IPA phonetic transcription system. The word is pronounced as "la-nuh". The first syllable is pronounced with a short "a" sound, represented by /æ/. The second syllable has a neutral vowel sound, represented by /ə/. Finally, the word ends with a soft "h" sound, which is not pronounced, but indicates that the stress of the word is on the first syllable. The spelling of "Lannah" accurately reflects its pronunciation using the IPA system.