"Sixth Baron Byron of Rochdale" is a specific title that refers to a particular individual, but there are a few synonymous phrases that can be used to refer to him. One option is simply "Lord Byron," as he is a member of the British nobility and holds the title of baron. Additionally, he can be referred to as "Byron of Rochdale" or "Byron, the Sixth Baron of Rochdale" to emphasize his place within the Byron family and his specific position as the sixth individual to hold this particular title. Overall, while "Sixth Baron Byron of Rochdale" is a formal and specific way to refer to this individual, there are a few other options that can convey the same information in a slightly different way.