From Wiktionary, the free dictionary
From Javanese nusa (ꦤꦸꦱ, “island”), from Old Javanese nūsa (“island”).
Nusa
- an unknown-gender given name from Java (Kuningan, Cilacap, Waikanabu, Surakarta, Wangkanapi), which means "island" or "land" (colloquially)