Variations like Aisha/Ayesha or Yusuf/Yousuf represent the same underlying Arabic name filtered through different transliteration conventions — Aisha and Yusuf tend to follow more standardized modern Arabic transliteration, while Ayesha and Yousuf reflect historical South Asian (particularly Urdu/Persian-influenced) phonetic spelling habits common in India, Pakistan, and Bangladesh. Neither version is ‘incorrect’ — both are valid renderings of the same name. For families abroad, the practical recommendation is to choose the spelling that will be easiest for local schools, government systems, and daily use in your country of residence, and then apply that spelling with complete consistency across the birth certificate, passport, and all future official documents, since spelling mismatches between documents can create real administrative complications later.