Where does “երկուշաբթի” come from?

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

երկուշաբթի (Armenian): Monday

Definitions

Monday

Ancestry of “երկուշաբթի”, step by step

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

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