There are many origins of compound surnames. Some derive from royal or official titles, place-names, professions, while others originate from non-Han Chinese clans that lived in ancient China or were simply created by combining two single-character family names.
101 Most Common Surnames in China and Their Meanings (2022)
I'm interested in the claim in bold, since I haven't encountered such a 2-character family name before. It reminds me of how (with English names) some people take on hyphenated surnames when getting married, or give such names to their children.
Question: What is an example of a surname formed by combining two single-character family names?