What last name can you give an adopted child if their background is completely unknown?

AdoptionChildren
What last name can you give an adopted child if their background is completely unknown?
Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 5 years ago

It is forbidden to give any one a name of a family or a tribe that he does not really belong to. If you have no knowledge at all about his family, you can give him after the name of the place or city or country he belongs to.

'Wassalam.