It's to do with inheritance and traceability in Egyptian society. If you give her Amira Rose , it simply won't be understood or traceable to him and his family.
BUT....
As you know a christian can not inherit from a muslim....
If you are planning to live here, educate then tbh, it'd be better IMHO if you did have Amira Rose it'll be more 'workable' here. It give her the option of using either surname.
My DS has his name, his dad's name, the grand father the ggf etc. However DH regrets this now and fears for negative reactions/racism. He wanted to change DS name, the first name
I'm refusing this, but call him so while his birth certificate has the full Egyptian lineage, he is known as . I'll change it by deed poll eventually. (thinking DH will bugger off anyway in the end)
FWIW, I've seen how these men change when DC come along, if you are not married, then tbh you need to protect your DD, and not ot discount your own name and place in the situation.
If her dad does get his act together and marry you, you can change the birth cert without any hassle at all.
I regret being stupidly naive and doing the 'right' thing by DH, he has certainly not done the right thing by us in the last 5 yrs....
(actually he's not even DH either, we are not married, but 3yrs of living in that place, we had to pretend, so it's force of habit)