Where does “Yuusuf” come from?

Yuusuf (Somali) comes from Arabic يُوسُف, from Hebrew יוסף, from Hebrew הוֹסִיף — to add.

Ancestry of “Yuusuf”, step by step

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