What is the correct way to romanize ッジ?


According to
[Wikipedia](https://en.wikipedia.org/wiki/Hepburn_romanization#Double_consonants),
ッチ is rendered as _tch_ , not _cch_ (etchi not ecchi). Logically I would think
that ッジ would then be _dj_ but there's no example of it. What is the correct
way? _dj_ or _jj_? Is there any comprehensive guide to Hepburn romanization
that helps with this?




AFAIK `cch => tch` is the _only_ exception defined in the Hepburn romanization
system and its variants (such as [パスポート式](http://www.hyogo-
passport.jp/main/hebon.html)). All the other 促音 (`っ`) are expressed by
repeating the same consonant. Specifically, I'm not aware of any romanization
standard which uses `dj`. So if you want to strictly obey the rule, バッジ would
be rendered as _bajji_ even in the Hepburn system which is thought to be
closer to English pronunciation. In
[訓令式](https://en.wikipedia.org/wiki/Kunrei-shiki_romanization) this would be
_bazzi_. IMEs accept both.

Traditional Japanese words occasionally have っち (eg, 八丁堀【はっちょうぼり】, 坊っちゃん,
湿地【しっち】), but probably there's no word that contains っじ/っぢ. Perhaps that's why
there isn't any standard. There are many katakana combinations which are used
to write loanwords but are not strictly defined in the traditional
romanization systems (eg, ツァ, ティ, ドゥ). They are not suitable for writing non-
Japanese-origin words in the first place.




AFAIK `cch => tch` is the _only_ exception defined in the Hepburn romanization
system and its variants (such as [パスポート式](http://www.hyogo-
passport.jp/main/hebon.html)). All the other 促音 (`っ`) are expressed by
repeating the same consonant. Specifically, I'm not aware of any romanization
standard which uses `dj`. So if you want to strictly obey the rule, バッジ would
be rendered as _bajji_ even in the Hepburn system which is thought to be
closer to English pronunciation. In
[訓令式](https://en.wikipedia.org/wiki/Kunrei-shiki_romanization) this would be
_bazzi_. IMEs accept both.

Traditional Japanese words occasionally have っち (eg, 八丁堀【はっちょうぼり】, 坊っちゃん,
湿地【しっち】), but probably there's no word that contains っじ/っぢ. Perhaps that's why
there isn't any standard. There are many katakana combinations which are used
to write loanwords but are not strictly defined in the traditional
romanization systems (eg, ツァ, ティ, ドゥ). They are not suitable for writing non-
Japanese-origin words in the first place.

