Where does “tonkotsu” come from?

tonkotsu (English) comes from Japanese 豚骨, from Japanese 骨, from Sanskrit कपाल, from Proto-Indo-Iranian kapā́las, from Proto-Indo-European káp-ōl-, from Proto-Indo-European kap- — to seize, hold.

tonkotsu (English): A Japanese broth made from pork marrow, typically...

Definitions

A Japanese broth made from pork marrow, typically...

Ancestry of “tonkotsu”, step by step

Step	Language	Word	Meaning
1	Japanese	豚骨	tonkotsu
2	Japanese	骨	bone; a bone, particularly a covering bone such...
3	Sanskrit	कपाल	skull, cranium; bowl
4	Proto-Indo-Iranian	kapā́las	skull
5	Proto-Indo-European	káp-ōl-	head, bowl
6	Proto-Indo-European	kap-	to seize, hold

Every word from Proto-Indo-European kap- →Every word from Proto-Indo-European káp-ōl- →Every word from Proto-Indo-Iranian kapā́las →