Well, A for effort. But I'm not a fan of created names and I wouldn't want anyone to think you couldn't spell
Estella properly.
It's a fun mental exercise though:
Eu = good (Greek)
Stella = star (
Roman)
Eustella = a good star? :-)
Eu = good (Greek)
Astra = star (Greek)
Eustra = good star? :-/