Seijiro as a Baby Name. Meaning and Origin of Seijiro

What is the meaning of the name Seijiro ?

The baby name Seijiro is a Male name , 3 syllables long and is pronounced IPA: /seːdʑiɾoː/; respelling: 'SAY-jee-roh' (Sei-ji-rō).

Seijiro is Japanese in Origin.

Seijiro is a Japanese masculine given name, typically written Seijirō in Hepburn. It combines Sei (誠 “sincerity,” 清 “purity,” 正 “rightness,” 政 “governance,” or 星 “star”) with the suffix Jirō (次郎/二郎) meaning “second son.” As with many Japanese names, meanings vary with the kanji selected, so parents can emphasize virtue, clarity, or celestial imagery while retaining the traditional -jirō element.

The -jirō ending was common from the Edo through early Shōwa eras to mark birth order, and today gives the name a classic, gentlemanly tone rather than a literal ranking. Common spellings include Seijiro, Seijirō, and Seijirou; in kana it appears as せいじろう or セイジロウ. Short forms include Sei and Jirō. Kanji pairings such as 誠二郎 (“sincere second son”) or 清次郎 (“pure second son”) are well established, making Seijiro a time-honored, dignified choice in modern Japan.

⚙ Seijiro is a rare name. Across 3 countries, we found 11 recorded uses of it.