Original: In the Harry Potter books, author J.K. Rowling chose the surname of the Professor of Transfiguration, Minerva McGonagall, because she had heard of McGonagall and loved the surname.
Simplified: In the Harry Potter books, author J.K. Rowling chose the surname of the Professor of Transfiguration, Minerva McGonagall, because she had heard of McGonagall and loved the name.