Seiji

/S-E-I-J-I/

Boy Buddhist Japanese origin JapaneseAmerican

Tranquil governance — from the Japanese Sei (静, quiet, tranquil) and Ji (治, to govern, to order, to heal). The name names the calm and ordering hand of one who leads with composure, settling and steadying what is in their charge.

See Seiji scored for your family

Meaning & origin

Seiji is a boy's name of Japanese origin, traditionally used in Buddhist families. The name means "Tranquil governance — from the Japanese Sei (静, quiet, tranquil) and Ji (治, to govern, to order, to heal). The name names the calm and ordering hand of one who leads with composure, settling and steadying what is in their charge." and belongs to the Peace cluster — names meaning calm, serenity, and inner stillness.

Common among Japanese, American families, Seiji carries cultural weight that goes beyond its dictionary definition — it's a name with a story and a community.

Numerology of Seiji

Numerology assigns each name a single-digit destiny number by summing its letter values. Different schools use different mappings — NameRoot computes both so you can see how Seiji resonates in either tradition.

Pythagorean
7
introspection and spiritual wisdom
Chaldean
11
intuition and inspired leadership (master number)

How Seiji sounds

NameRoot scores the phonetic fit of every name against the sound of your last name. The pronunciation of Seiji breaks down into 5 phonemes: /S-E-I-J-I/. In the app, you'll see how those sounds flow with your family name across rhythm, stress, and consonant clusters.

Nicknames

Common affectionate forms of Seiji — useful for everyday family conversation, early childhood, or as standalone given names themselves.

Sei

The six signals, applied to Seiji

NameRoot scores every name across six independent dimensions. Here's how Seiji maps to each — install the app to see the full compatibility score for your specific family.

01 — Birth Star
Nakshatra match
Enter your baby's birth date in the app and we'll compute the nakshatra compatibility score.
02 — Numerology
Destiny alignment
Pythagorean and Chaldean life-path calculations (destiny 7) matched against your family's own numerology profile.
03 — Phonetics
Last-name fit
Rhythm, stress, and consonant clusters measured with IPA to see how Seiji flows with your family name.
04 — Meaning
Peace
Seiji belongs to the Peace cluster — names meaning calm, serenity, and inner stillness.
05 — Cultural & Tradition
Buddhist
As a Buddhist name, Seiji carries religious and cultural weight scored against your family's heritage — plus grandparent-name matches, saint's-day alignment, and generational naming patterns scored against your family tree.
06 — Uniqueness
Popularity balance
How common Seiji is today versus historically — finding the sweet spot between familiar and forgotten.

Names similar to Seiji

If Seiji resonates with you, these names live in the same world — drawn from the same tradition, sharing the same meaning, or echoing a similar sound.

From the same tradition

Other Buddhist boy names, common in Japanese families

Om
The sacred syllable, the primordial sound of creation — the most sacred symbol in Hinduism. Om encompasses all sounds, all words, all meanings.
Kai
Ocean, sea, the vast expanse of water that connects every shore — Kai is a name shared across cultures, meaning sea in Japanese and Hawaiian, and carrying the limitless horizon of open water in every version. It speaks of depth without bottom, strength that moves in tides rather than explosions, and the serene power of an element that covers most of the earth and answers to the moon
Rishi
Sage, seer, the enlightened being who perceives truth through intuitive vision
Haruto
Sunlight soaring — combining haru (sun, spring) with to (fly, soar). A name of radiant ambition that pairs the warmth of sunlight with the freedom of flight, aspiring to a life that rises and shines.

Sharing the same meaning

Other Buddhist boy names from the Peace cluster

Souma
Swift truth — Souma (Japanese 颯真, from sō 'swift wind, brisk' + ma 'truth, sincerity') is a Reiwa-era favorite combining the swift breeze with sincere truth.
Yuto
Distant, leisurely + Big Dipper constellation — vast patience guided by celestial navigation
Minato
Harbour, port — where ships find shelter and journeys begin. A name of safe arrival and new departures

Names that sound similar

Buddhist boy names that open with the same syllables as Seiji

Seojun
From Korean 서준 (seojun). Hanja: 瑞 (seo, auspicious) + 俊 (jun, talented).
Sangye
Buddha — the Awakened One — as a living aspiration, a name that calls the child to embody the qualities of enlightened mind: clarity, compassion, and boundless awareness. In Tibetan Buddhism Sangye is the first of the Three Jewels to which every Buddhist takes refuge, and to name a child thus is the most profound statement of aspiration a Tibetan Buddhist parent can make
Si-woo
Korean 시 (si — poem) + 우 (woo — universe).

Common questions about Seiji

What does the name Seiji mean?

Seiji means "Tranquil governance — from the Japanese Sei (静, quiet, tranquil) and Ji (治, to govern, to order, to heal). The name names the calm and ordering hand of one who leads with composure, settling and steadying what is in their charge.." It is a boy name of Japanese origin, traditionally used in Buddhist families.

Is Seiji a boy or girl name?

Seiji is most commonly used as a boy name.

What is the origin of the name Seiji?

Seiji is of Japanese origin, used in Buddhist tradition, commonly among Japanese, American families.

What are common nicknames for Seiji?

Common short forms of Seiji include Sei.

What is the numerology of Seiji?

Seiji has a Pythagorean destiny number of 7 — introspection and spiritual wisdom.

See how Seiji scores for your family

NameRoot is the only baby-name app that scores every name across 6 signals against your specific family context. Download free — Seiji is waiting.

Get NameRoot — free