Where does “ជប៉ុន” come from?

ជប៉ុន (Khmer) comes from French japon, from Portuguese Japão, from Malay Jepang, from Hokkien 日本, from Middle Chinese 日本 — Land of the Rising Sun.

Ancestry of “ជប៉ុន”, step by step

Step	Language	Word	Meaning
1	French	japon	japanware; Japanese porcelain
2	Portuguese	Japão	Japanese
3	Malay	Jepang	Japanese
4	Hokkien	日本	Japan; Japanese; Japan
5	Middle Chinese	日本	Land of the Rising Sun