Where does “Ronin” come from?

Ronin (English) comes from English ronin, from Japanese 浪人, from Middle Chinese 浪人.

Ancestry of “Ronin”, step by step

Step	Language	Word	Meaning
1	English	ronin	A masterless samurai; A student who has failed...
2	Japanese	浪人	a masterless samurai; a vagrant, a vagabond, a...
3	Middle Chinese	浪人	—