From Late Latin Sīnae (“the southern Chinese”), from Ptolemy's Ancient Greek Σῖναι (Sînai, “the southern Chinese”), of uncertain etymology but probably from Sanskrit चीन (Cīna, “southern China”), possibly via Arabic صِين (ṣīn, “southern China; the southern Chinese”) and usually held to derive from Old Chinese 秦 (*Dzin, “Qin”). See "Names of China" at Wikipedia.
- A combining form relating to China or the Chinese, in those terms' various senses.
In the 1970s, Sino-Soviet rivalry also spread to Africa and the Middle East.
He's a Sino-Kadazan: half Chinese, half Kadazan.