The spelling of the word "alvi" can be explained using the International Phonetic Alphabet (IPA). The first syllable is pronounced as /æl/, with the "a" sound as in "cat" and the "l" sound at the end. The second syllable is pronounced as /vi:/, with a long "i" sound and a soft "v". Therefore, the correct spelling would be "alvi", with an "a" and "v" in the first syllable and a long "i" in the second syllable. This pronunciation and spelling are commonly used in English.