The spelling of the surname "Lastinger" can be explained using the International Phonetic Alphabet (IPA). In IPA, the word is pronounced as "læstɪŋər". The "l" is pronounced with a clear "l" sound, followed by a short "æ" sound. The following "s" is pronounced with a soft "s" sound, and the "t" with a hard "t" sound. The "ɪ" indicates a short "i" sound, followed by a nasalized "ŋ" sound, and ending with a soft "ər" sound. This is a unique and easily recognizable pronunciation that sets the name apart.