This is the 1983rd most frequent Arabic word.
اسمه
"His name."
In this sentence, 'اسمه' (his name) is used to refer to the name of the person, Khaled, indicating possession ('his').
اسمه خالد وهو من مصر.
His name is Khaled and he is from Egypt.
Here, 'اسمه' is used to provide the name of the person mentioned, Ahmed, functioning as a narrative descriptor.
التقيت بشخص اسمه أحمد.
I met a person named Ahmed.
In this narrative dialogue, 'اسمه' is again used to introduce the name of the individual being mentioned, Ali, making it clear to whom she is referring.