The spelling of the name Tahni can be explained using the International Phonetic Alphabet (IPA). The first two letters "Ta" make the sound /tʌ/, which is similar to the "u" sound in "under". The "h" is silent, and the following "n" makes the sound /n/ as in "noon". The final letter "i" is pronounced as /i/, which is the same sound as the "ee" in "bee". Therefore, the correct way to spell the name Tahni is /tʌni/.