Likely from a combination of Classical Newar 𑐳𑑃𑐖 (sãja) + देय् (deê), from Classical Newar 𑐡𑐾𑐱 (deśa), from Sanskrit देश (deśa).
संदेय् • (saṃdeê) ? (Newa Spelling 𑐳𑑄𑐡𑐾𑐫𑑂)