Where does “Ê-cốt” come from?

Ê-cốt (Vietnamese) comes from French Écosse, from Middle French Escosse, from Old French Escoce, from Latin Scotia, from Ancient Greek σκοτία, from Ancient Greek σκότος, from Proto-Indo-European skh₃tos, from Proto-Indo-European (s)ḱeh₃- — darkness, shadow.

Ancestry of “Ê-cốt”, step by step

Step	Language	Word	Meaning
1	French	Écosse	—
2	Middle French	Escosse	—
3	Old French	Escoce	—
4	Latin	Scotia	Scotland
5	Ancient Greek	σκοτία	darkness, gloom; scotia, cavetto, so called from...
6	Ancient Greek	σκότος	darkness, gloom
7	Proto-Indo-European	skh₃tos	—
8	Proto-Indo-European	(s)ḱeh₃-	darkness, shadow

Every word from Proto-Indo-European (s)ḱeh₃- →Every word from Proto-Indo-European skh₃tos →Every word from Ancient Greek σκότος →