Thalassa (Θάλασσα)
Meaning: "Sea" or "from the sea."
Why it fits: Greece is surrounded by the deep, beautiful blue of the Aegean and Ionian seas. For a blue-eyed princess, this name evokes the vast, mesmerizing blue of the ocean. It's a very ancient Greek word for the sea, symbolizing depth, calmness, and natural beauty. A princess named Thalassa would embody the serene yet powerful spirit of the Greek waters, and her eyes would be like the clearest parts of the sea.