One way to hold Cajun: start with a group of families. They were French speakers from Acadia in eastern Canada, and they ended up in the warm, wet south of Louisiana. Their name travelled with them and wore down in the mouth — Acadien, Cadien, Cajun. Everything else the word touches is something those families carry: the French they still speak, the music they dance to, the pepper in their cooking. So the word is really one word: a people, and then whatever wears their name.
From the word’s history
An Anglicisation of Acadian French Cadien, itself a shortened Acadien ('Acadian'), reflecting the Acadian dialect turning /dj/ into a j-like sound. The people's name is literally the place their families came from, worn short.
這是阿卡迪亞法語 Cadien 進入英文後的拼法，而 Cadien 又是 Acadien（阿卡迪亞人）掉了開頭的樣子；阿卡迪亞方言把 d 加 i 的音唸成接近英文 j 的音，所以寫成 Cajun。族群的名字，其實就是他們家族來的那個地方唸短了。
Wiktionary, "Cajun"
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