👤 Japanese Full Name Splitter

Paste one full name per line. The tool tries whitespace split, then a 300+ surname dictionary, then a 2-character fallback to extract family and given names with a confidence rating. Edit any wrong split inline and export as CSV / TSV. Readings are filled instantly from a built-in 50 KB dictionary.

✅ 100% free, no signup, name data never sent to any server

⚠️ About Accuracy

This tool is not 100% accurate. Compound surnames, rare names, non-Japanese names, and katakana-only names may be misclassified. Always verify manually before final use.

Readings come from a built-in 50 KB dictionary. It runs instantly, but rare proper nouns and uncommon kanji may be left blank.

🔒 About Privacy

・All processing happens entirely in your browser
・Name data is never sent to any server
・No storage logs, no upload history, no database

Full names (one per line)

Result (editable)

📖 How to Use

1

Paste full names

One full name per line. Works with or without whitespace.
2

Run split

Click Split. Strategies: whitespace, 300+ surname dictionary, 2-char fallback.
3

Download CSV / TSV

Low-confidence rows can be edited inline before exporting as CSV or TSV.

❓ FAQ

How is confidence determined?

Whitespace split gives High. The 300+ surname dictionary longest-match gives Medium. Everything else (2-character fallback) gives Low. Readings come from the surname, given-name, compound, and single-kanji dictionaries via longest match.

Are compound surnames handled?

The 300+ dictionary includes major compound surnames (Sasaki, Hasegawa, Igarashi, etc.) and uses longest-match. Rare names may still be misclassified.

What about foreign or katakana-only names?

Not supported. Add a space manually or correct the result before export.

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🐛 Found a bug or issue with this tool?

Free to use, no signup. Even just the steps to reproduce are helpful. Reports go directly to the operator and help us fix issues.