Proto-Indo-European root meaning "star." Buck and others doubt the old suggestion that it is a borrowing from Akkadian istar "venus." The source of the common Balto-Slavic word for "star" (Lithuanian žvaigždė, Old Church Slavonic zvezda, Polish gwiazda, Russian zvezda) is not explained.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit star-; Hittite shittar, Greek aster "star," with derivative astron; Latin stella, Breton sterenn, Welsh seren "star."
Others are reading
<a href="https://www.etymonline.com/word/Estella">Etymology of Estella by etymonline</a>
Harper, D. (n.d.). Etymology of Estella. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/Estella