There are probably hundreds of them
Sylvester Stallone
An actress who has nine letters in their last name include Amy Brenneman and Kristen Chenowith.
Anastasiya Zadorozhnaya.
A?I?o? /S?e?d???
The actor and presenter you are referring to is "Matthew Fox." He has a first name with 7 letters and a surname with 3 letters.
There are probably hundreds of them
The US singer you are looking for is Bruno Mars. His first name, "Bruno," has five letters, and his surname, "Mars," has four letters, fitting the criteria provided.
Edward Norton
I don't have the full answer but some of the letters are _O_E
· Harrison Ford
Sylvester Stallone
Claudia winkleman
An actress who has nine letters in their last name include Amy Brenneman and Kristen Chenowith.
Anastasiya Zadorozhnaya.
tv presenter 4 and 4
Dick Clark