Yoshisue TOKUGAWA/Yoshisue SERADA (date of birth and death unknown) was a samurai warrior who was active from the end of the Heian period to around the beginning of the Kamakura period, and he was the founder of the Egawa Clan and the Serada Clan, which were branches of the Nitta Clan from the Seiwa-Genji (Minamoto Clan).
得川義季/世良田義季（とくがわよしすえ/せらだよしすえ、生没年不詳）は、平安時代末期から鎌倉時代初期頃に上野国で活動した武士で、清和源氏の新田氏の支流、得川氏およびの世良田氏始祖である。