Where does “يوسف” come from?

يوسف (Arabic) comes from Hebrew יוסף, from Hebrew הוֹסִיף — to add.

Ancestry of “يوسف”, step by step

Step	Language	Word	Meaning
1	Hebrew	יוסף	—
2	Hebrew	הוֹסִיף	to add

يوسف — Etymology, Origin & Word History | Etymology Explorer