Tawada no sai is named after Tawada Shinboku (多和田真睦) whose nickname was Meganou (メガントウ). Tawada (1814 – 1884) was a student of Matsumura Sokon (1798 – 1890) and was from Shuri, Torihori. He was an expert in not only the sai, but also the bo.
In the Minowa line of Kobudo this kata is taught at sandan and is unique compared to other sai kata that are taught. Here is an example of it performed at the Taira Shinken memorial demonstration.