Where does “喀拉蚩” come from?

喀拉蚩 (Chinese) comes from English Karachi, from Urdu کراچی, from Sindhi ڪراچي, from Sindhi ڪولاچي.

Ancestry of “喀拉蚩”, step by step

Step	Language	Word	Meaning
1	English	Karachi	—
2	Urdu	کراچی	—
3	Sindhi	ڪراچي	—
4	Sindhi	ڪولاچي	—