Where does “กรกฎาคม” come from?

กรกฎาคม (Thai) comes from Thai อาคม, from Pali āgama, from Pali a-, from Sanskrit अ-, from Proto-Indo-Iranian a-, from Proto-Indo-European n̥-, from Proto-Indo-European ne — not.

กรกฎาคม (Thai): July the seventh month of the year under the Gregorian calendar

Definitions

July the seventh month of the year under the Gregorian calendar

Ancestry of “กรกฎาคม”, step by step

กรกฎาคม traces back through two separate lines of ancestry.

via Thai อาคม

Step	Language	Word	Meaning
1	Thai	อาคม	magic; spell; charm; coming
2	Pali	āgama	coming, arrival
3	Pali	a-	no; not; non; etc; not; lacking; without; etc
4	Sanskrit	अ-	un-, not; Used in the formation of imperfect,...
5	Proto-Indo-Iranian	a-	un-, a-
6	Proto-Indo-European	n̥-	not, un-
7	Proto-Indo-European	ne	not

via Thai กรกฎ

Step	Language	Word	Meaning
1	Thai	กรกฎ	crab
2	Sanskrit	कर्कट	crab; the sign Cancer; a particular bird
3	Proto-Indo-Aryan	karkartas	—

Every word from Proto-Indo-European ne →Every word from Sanskrit अ- →Every word from Proto-Indo-European n̥- →