The spelling of the word "wichert" can be explained using the International Phonetic Alphabet (IPA) transcription. The initial sound is represented by the voiceless bilabial fricative /w/. The following sound is a short /ɪ/ as in "bit." The third sound is a voiceless alveolar fricative /ʃ/ as in "she." The final sound is a voiced alveolar stop /d/ as in "dog." Therefore, the correct spelling of this word is "wichert" with the phonetic transcription /wɪʃərt/.