Where does “ヘスティアー” come from?

ヘスティアー (Japanese) comes from Ancient Greek ἑστία — hearth, fireplace, altar; house, family.

Ancestry of “ヘスティアー”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἑστία	hearth, fireplace, altar; house, family

ヘスティアー — Etymology, Origin & Word History | Etymology Explorer