Seiichi as a Baby Name. Meaning and Origin of Seiichi

What is the meaning of the name Seiichi ?

The baby name Seiichi is a Male name , 3 syllables long and is pronounced /se.i.tɕi/ (Japanese IPA); approx. "SAY-ee-chee" or "seh-ee-chee".

Seiichi is Japanese in Origin.

Seiichi is a Japanese masculine given name formed from sei + ichi. Depending on the kanji, meanings include 誠一 “sincere + one,” 正一 “upright/correct + one,” 清一 “pure + one,” or 精一 “refined/spirited + one.” The element ichi (一) literally means “one,” frequently signaling the first-born son or conveying primacy. Written in kana as せいいち or in katakana セイイチ, the name’s nuance is set by the chosen characters.

It was widespread in the late Meiji through Shōwa eras, when -ichi and -kazu endings were fashionable for eldest sons; still recognized today as a classic, steady choice. Notable bearers include inventor Seiichi Miyake and artist Seiichi Hayashi, reinforcing associations of diligence and sincerity. Variants encompass numerous kanji spellings, occasional romanization as Seiiti in older systems, and diminutives such as Sei or Ichi. Related forms sharing kanji concepts include Shōichi or Masaichi (alternative readings of 正一), though Seiichi remains distinct in pronunciation.