The spelling of the word "witzke" is based on the pronunciation of its German origin. The IPA phonetic transcription shows that the "w" sound is pronounced like an English "v" sound /v/. The "i" is pronounced as a long "e" sound /i:/, followed by a "tz" consonant cluster pronounced as /ts/. Finally, the "k" sound is pronounced as a hard "g" /k/. Therefore, the correct spelling of this word is "witzke" /ˈvɪtskə/.