What does Yusuf mean?
The Arabic form of the prophet Joseph (Yusuf), of Hebrew origin (Yosef), traditionally understood as 'he will add' or 'God shall increase'. The Arabic form itself carries no independent Arabic root meaning; Surah Yusuf is named for him. Also spelled Yousuf, Yousef.
What does Ahmad mean?
From the root h-m-d (ح-م-د, 'to praise'), a superlative meaning 'most praiseworthy, most commendable'. It shares its root with the name Muhammad and is itself cited as one of the names of the Prophet. Also spelled Ahmed.