Where does “พันธมิตร” come from?

พันธมิตร (Thai) comes from Thai มิตร, from Sanskrit मित्र, from Proto-Indo-Aryan mitrás, from Proto-Indo-Iranian mitrás, from Proto-Indo-European mēy- — soft, tender, dear.

พันธมิตร (Thai): alliance; ally

Definitions

alliance; ally

Ancestry of “พันธมิตร”, step by step

พันธมิตร traces back through two separate lines of ancestry.

via Thai มิตร

Step	Language	Word	Meaning
1	Thai	มิตร	friend; crony
2	Sanskrit	मित्र	a friend, companion, associate; the sun;...
3	Proto-Indo-Aryan	mitrás	friend
4	Proto-Indo-Iranian	mitrás	covenant; treaty; agreement
5	Proto-Indo-European	mēy-	soft, tender, dear

via Thai พันธ

Step	Language	Word	Meaning
1	Thai	พันธ	—
2	Sanskrit	बन्ध	a binding, fetter, tie, bond; tying, fastening,...
3	Sanskrit	बन्ध्	to bind, tie
4	Proto-Indo-European	bʰendʰ-	to bind; bond

Every word from Proto-Indo-European mēy- →Every word from Proto-Indo-Iranian mitrás →Every word from Proto-Indo-Aryan mitrás →