Where does “เอริเทรีย” come from?

เอริเทรีย (Thai) comes from English Eritrea, from Italian Eritrea, from Latin Erythraea, from Ancient Greek Ἐρυθραία, from Ancient Greek Ἐρυθραῖος, from Ancient Greek Ἐρυθραί, from Ancient Greek ἐρυθρός, from Proto-Hellenic *erutʰrós.

Ancestry of “เอริเทรีย”, step by step

Step	Language	Word	Meaning
1	English	Eritrea	—
2	Italian	Eritrea	—
3	Latin	Erythraea	the territory of Erythrae, Beotia
4	Ancient Greek	Ἐρυθραία	Erythraea or Eritrea
5	Ancient Greek	Ἐρυθραῖος	—
6	Ancient Greek	Ἐρυθραί	Erythrae; Ildırı, Turkey
7	Ancient Greek	ἐρυθρός	reddish, red
8	Proto-Hellenic	*erutʰrós	—

Every word from Proto-Hellenic *erutʰrós →Every word from Ancient Greek ἐρυθρός →Every word from Ancient Greek Ἐρυθραί →