He lost his father on October 16, 1834 and succeeded the headship of the family at the age of four; he changed his name to Makoto (imina [personal name]), Kiin (azana [Chinese courtesy name which was, historically, the name formerly given to adult Chinese men, used in place of their given name in formal situations; scholars and the literati of Japan adopted this custom of courtesy name]), and his common name to Seiichiro.
天保5年（1834年）9月14日に父を亡くし、4歳で家督を相続すると、諱を真琴、字を徽音、通称を誠一郎とした。