恩珠

Korean names are written with their original Chinese-character spelling and given Mandarin readings. 恩珠 corresponds to 은주 (Eun-ju): 恩 = 은 ('grace/kindness'), 珠 = 주 ('pearl'). A real-world bearer is the late Korean actress 李恩珠 Lee Eun-ju (1980–2005), known for the film 《红字》 (The Scarlet Letter); the name is also extremely common as a generic K-drama heroine name.

Korean female names ending in -珠 (-ju, 'pearl') and -恩 (eun-, 'grace') are both very common in subtitled dramas — that's why this name shows up in subtitle frequency lists.