How to say "duke" in Japanese

• 公爵こうしゃくCommon
  nounThe common word for the noble rank of duke, and the default choice when you need the title itself. Its gloss also covers 'prince', so it can sometimes render that word too.
  これは、あの殺人的さつじんてきな公爵こうしゃくに復讐ふくしゅうしようという彼かれの願ねがいを強つよめただけだ。↗

  This only increased his desire to be revenged on the murderous duke.
• デューク
  nounThe katakana borrowing of English 'duke'. Less common than 公爵, it appears chiefly for foreign names and titles, and is seldom the word you want for the rank itself.
• 公こう
  noun, noun (suffix)The single-character title, given for both 'duke' and 'prince'. It is less common than 公爵 and is seldom the word you want for the noble rank in ordinary use.

For the noble rank of duke, 公爵 is the common, default word; 「デューク」 is the katakana borrowing, used chiefly for foreign names and titles; 公 is the single-character title, less common and seldom what you need.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 公爵こうしゃくprince
• デュークduke
• 公こうduke