Where does “երկշաբաթի” come from?

երկշաբաթի (Old Armenian) comes from Old Armenian շաբաթ, from Classical Syriac ܫܒܬܐ, from Aramaic שַׁבְּתָא, from Hebrew שַׁבָּת, from Akkadian šapattum — 15.

երկշաբաթի (Old Armenian): Monday

Definitions

Monday

Ancestry of “երկշաբաթի”, step by step

երկշաբաթի traces back through two separate lines of ancestry.

via Old Armenian շաբաթ

Step	Language	Word	Meaning
1	Old Armenian	շաբաթ	Sabbath; Saturday; week
2	Classical Syriac	ܫܒܬܐ	Sabbath, Saturday; week; dill
3	Aramaic	שַׁבְּתָא	sabbath
4	Hebrew	שַׁבָּת	Sabbath, Shabbat; weekly day of rest; sabbath
5	Akkadian	šapattum	15

via Old Armenian երկու

Step	Language	Word	Meaning
1	Old Armenian	երկու	two; second; besides, moreover
2	Proto-Indo-European	dwóh₁	two

Words derived from “երկշաբաթի”

երկուշաբաթի
երկուշաբթի

Every word from Akkadian šapattum →Every word from Hebrew שַׁבָּת →Every word from Aramaic שַׁבְּתָא →