Thus Confucius 'student Tzu Kung had the double surname Tuan Mu, but his descendants changed the name to Mu to avoid being targeted by members of a clan with a feud against the Tuan Mu line. Other hsing-shih developed because people omitted some brush strokes when writing to save trouble, adopted characters to match the sound of their names, or just plain wrote the originals incorrectly.
有些是為了避禍，像是孔子的門生子貢，原姓端木，後人為避仇而改姓木或沐。另外，也有因為省略筆畫、音訛或筆誤，而變出另一個姓。