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my chinese name

锁福 means lock the happiness.
士与是谐音，士 and 是 have the same pronunciation.
so i think 士福 represents 是福，means you are the lucky dog or others` happiness.
I prefer 锁福。

One thing to think about. I guess that you're literally translating "Yusuf" (يوسف) into the sounds of Chinese, right? But Chinese names work pretty differently. The first chracter is your family name, and the second two characters are your "given name" (first name).;

So people might think that your last name is 尤 and your first name 锁福. So people might refer to you as "Mr. 尤" or if they're friendly enough they'll call you 锁福 since they might think that's your first name.

That's why I just chose a totally different Chinese name based on a meaning and characters that I liked. My English name Robert sounds like "罗伯特" in Chinese but to avoid the other problem I just made a new name.

Anyway, do what you like but I figured I should let you know, because it was a surprise to me!

You know, in China, there are also many Muslim, and so am I.
I have heard like 玉素甫， 尤素甫。 ''福'' is too near by Chinese, but Muslim, but you can use 福 if you want.
In my mind, you are not Chinese, but a foreigner, and you are a Muslim, so you can use all about them, only if you want.
I am sorry for my English is not good, but I hope I can help you.

in my opinion,more simple more suitable . 尤瑟夫 is better. Normally your name is translated to this one in China.
带“福”字的，显得俗气~

choose 尤士福