From Wiktionary, the free dictionary
Connected with the Middle Korean 구슬〮 (kwùsúl, “gem”).[1]
ᡤᡠ • (gu)
- jade
Borrowed from Mandarin 姑 (gū).
ᡤᡠ • (gu)
- paternal aunt (father's elder sister)
- ^ Lee, Ki-Moon, Ramsey, S. Robert (2011) A History of the Korean Language, Cambridge University Press, →ISBN, page 24