BabyNameScore

Kasai

Kasai is distinctive.

88/100

Strong Practical Fit

Balanced across pronunciation, everyday use, lifetime fit and international use.

Name Profile

  1. Pronunciation & Spelling

    Mostly read correctly

    Short, simple spelling with no unusual letter patterns. Commonly mispronounced as KAY-sigh.

    88/100

  2. Everyday Use

    Low risk

    95/100

  3. Growing Up

    Strong lifetime fit

    Works comfortably across child and adult settings.

    82/100

  4. International Use

    Broad international fit

    Works cleanly across the assessed languages and writing systems.

    85/100

NAME DETAILS

DOCUMENTED USE
Masculine
CLOSE SPELLINGS
Kasei
ORIGIN & HISTORY

About the name

Kasai has no single documented origin or meaning that this project can confirm. It could plausibly draw on a Japanese surname (itself of disputed/unexplained kanji meaning across the sources checked), the Kasai River/province region of Central Africa (whose name has no documented linguistic derivation in the sources checked), or function as an independently coined US given name. Readers should not treat any one of these as the confirmed source without a family's own account.

  1. 河西 / 葛西 / 笠井 (Japanese surname kanji, meaning disputed across sources); Kasaï (French, river/province name).
POPULARITY

Kasai over time

United States
#639RANK

Rank #639 gives national context, not a classroom forecast.

Uncommon in current U.S. usage. Ranked #639 in the U.S., 2025.

SourceU.S. Social Security Administration · 2025 release

Pronunciation & Forms

CLOSE SPELLINGS
  • Kasei
PRACTICAL LIFE

How This Name Lives

AT SCHOOL & DAY TO DAY

Phonetically simple and easy for a child to say and spell in English, though as a given name (rather than a surname) it has no established pronunciation convention or nickname tradition documented for US usage.

INTO ADULTHOOD

As an adult given name in the US, Kasai reads as distinctive and geographically/culturally ambiguous - it can suggest Japanese heritage to those who recognize the surname, or read as a fully invented modern name to others, without a single settled association.

Cultural Footprint

Official U.S. birth-registration data shows this name had the largest single-year popularity increase of any boys' name nationally in a recent year — rising more than 1,100 rank positions to enter the national top 1,000 for the first time. No dataset currently establishes a meaning or origin for this name.

EDITORIAL SYNTHESIS

The Decision

Kasai is spelled without unusual letter patterns, and it holds up in everyday use. Surname-dependent compatibility remains unassessed until a surname is added.

STRENGTH

Short, simple spelling with no unusual letter patterns. Uses standard characters that systems widely handle cleanly.

BEST FIT

Everyday Use is the strongest-scoring part of this name — no obvious nickname traps, rhymes, or initial issues detected.

FULL-NAME CHECK

See how it works with a surname.

Kasai