Where does “การสัญญา” come from?

การสัญญา (Thai) comes from Thai สัญญา, from Pali saññā, from Sanskrit संज्ञा, from Sanskrit ज्ञा, from Proto-Indo-Aryan ȷ́naH-, from Proto-Indo-Iranian ǰnaH-, from Proto-Indo-European ǵneh₃- — to know.

Ancestry of “การสัญญา”, step by step

การสัญญา traces back through two separate lines of ancestry.

via Thai สัญญา

Step	Language	Word	Meaning
1	Thai	สัญญา	sign: mark, symbol; emblem, token; signal,...
2	Pali	saññā	awareness
3	Sanskrit	संज्ञा	to agree together, be of the same opinion, be in...
4	Sanskrit	ज्ञा	to know
5	Proto-Indo-Aryan	ȷ́naH-	—
6	Proto-Indo-Iranian	ǰnaH-	—
7	Proto-Indo-European	ǵneh₃-	to know

via Thai การ

Step	Language	Word	Meaning
1	Thai	การ	work; matter; task; affair; prefixed to nouns to...
2	Pali	kāra	deed; doing, manner; production, application
3	Sanskrit	कार	gain, prize, booty; contest, war; an act, action
4	Sanskrit	कृ	to make
5	Proto-Indo-European	kʷer-	to do; to make; to build

Every word from Proto-Indo-European ǵneh₃- →Every word from Proto-Indo-Iranian ǰnaH- →Every word from Proto-Indo-Aryan ȷ́naH- →