Where does “κεφαλοτύρι” come from?

κεφαλοτύρι (Greek) comes from Greek τυρί, from Byzantine Greek τυρίν, from Ancient Greek τυρίον, from Ancient Greek τυρός, from Proto-Hellenic tūrós, from Proto-Indo-European tuh₂-ró-s, from Proto-Indo-European tewh₂- — to swell; to crowd; to be strong.