Where does “тхьэ” come from?

тхьэ (West Circassian) comes from Adyghe тхьэмафэ, from Adyghe мафэ, from Adyghe гъэмафэ, from Adyghe гъэ — year.

Ancestry of “тхьэ”, step by step

Step	Language	Word	Meaning
1	Adyghe	тхьэмафэ	week
2	Adyghe	мафэ	day
3	Adyghe	гъэмафэ	summer
4	Adyghe	гъэ	year

тхьэ — Etymology, Origin & Word History | Etymology Explorer