What happens when you use the individual characters in 姓氏 and 名字?
From my answer to this question What does this symbol mean? I explained 姓氏 It may be a good reference to your question

From my answer to this question Why is there such a difference between &quot;first name&quot; and &quot;last name&quot;? I explained 姓 and 名字


  In the past, most people in high society would have a 姓(family name), a 名 (given name) and a 字 (Courtesy name)


Example of using individual characters in 姓氏 and 名字:


他姓曹 = his last name is 曹
曹氏一族 = the clan of 曹 family
他姓曹，名操，字孟德 = his last name is 曹, first name is 操 and his courtesy name is 孟德