Where does “éka-” come from?

éka- (French) comes from Sanskrit एक, from Proto-Indo-Aryan Háykas, from Proto-Indo-Iranian Háykas, from Proto-Indo-European óynos — one; single.

éka- (French): eka-

Definitions

Step	Language	Word	Meaning
1	Sanskrit	एक	one; alone, solitary, single, happening only...
2	Proto-Indo-Aryan	Háykas	one
3	Proto-Indo-Iranian	Háykas	one
4	Proto-Indo-European	óynos	one; single

éka- — Etymology, Origin & Word History | Etymology Explorer