👤 Japanese Full Name Splitter

Paste one full name per line. The tool tries whitespace split, then a 200+ 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.

✅ 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.

🔒 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, 200+ surname dictionary, 2-char fallback.
3

Check confidence and fix

Low-confidence rows can be edited inline before export.
4

Download CSV / TSV

Export the corrected data as CSV or TSV.

❓ FAQ

How is confidence determined?

Whitespace-separated names get High. Matches against the 200+ surname dictionary get Medium. Everything else gets Low (2-character fallback).

Are compound surnames handled?

The 200+ 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.