The origin of surnames

This one I know is one of the largest two in Longgang Town, Yancheng (the other one is Baojia, and now Baojia of Hantang and other hotels and Fudi Palace in Yancheng, Jiangsu are major shareholders). My grandfather (who died at the age of 90 the year before last) has been in charge of the Longgang family. My family name is the same as my grandfather's. When I was a child, I asked my grandparents about the origin of this surname. Interpretation is a story. In earlier years, the surname of Yi nationality was not Yi nationality, but another surname with similar pronunciation. As a loyal minister, he was persecuted by treacherous court officials and his family was beheaded. After being chased by officers and men, he asked an old woman what the family name was. Grandma Lickitung was not clear, and said: gens. Because this family was preserved, it changed its surname from now on.