Namesakes

Other Royalty: 1 king
Otto of Greece (a.k.a. Otho)   1832-1862   Greece  
Roman and Byzantine Emperors: 1 emperor
Emperor Marcus Salvius Otho (a.k.a. Otho)   69  
Tolkien's Characters: 1 character
Otho Sackville-Baggins   (m)