Where does “Ορεστιάδα” come from?

Ορεστιάδα (Greek) comes from Ancient Greek Ὀρεστιάς, from Ancient Greek Ὀρέστης, from Ancient Greek ἵστημι, from Proto-Hellenic hístāmi, from Proto-Indo-European stísteh₂ti, from Proto-Indo-European steh₂- — to stand.

Ορεστιάδα (Greek): Orestiada large town in Evros in Greece