Where does “pinki” come from?

pinki (Xhosa) comes from English Pink, from Dutch pingelen, from West Frisian pingel — small item.

Ancestry of “pinki”, step by step

Step	Language	Word	Meaning
1	English	Pink	An operative of the Pinkerton National Detective...
2	Dutch	pingelen	to wrangle, to try to get a better price; to do...
3	West Frisian	pingel	small item