Jelaskan Ngaran dari Walungan Han (Koréa) dalam bahasa sunda

The Namhan méaning South Han, Gang méaning river is sometimes, but not always, referred to as the "Han" in South Korea. The term "South Han" is understood irrespective of which side of the border one stands.

Even though "Namhan" and "Bukhan" are homophones with the acronyms Namhan (남한; South Koréa) and Bukhan (북한; North Koréa), used commonly in South Koréa, this is a méré coincidence.  The hanja for the Han River is not "韓" ("Korea") but "漢" (the Chinese Han dynasty or "China" in general).