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From Youtube comment:
To non-Indonesian Onces, their "localized (Indonesian)" names:
Jihyo - "Jingga" - lit. "Orange" (the color, not the fruit)
Nayeon - "Nanda" - I assumed this as short form of "Ananda", a very polite and very formal way for an older person to address a younger one (usually at least with one generation gap), regardless of gender.
Momo - "Mona" - actually not originally Indonesian name, it's nevertheless quite a popular name for female in Indonesia
Sana - "Santi" - lit. "peace", it's origin is from Hindu/Sanskrit tradition, a common name for female in Indonesia
Mina - "Mirna" - a common name for female in Indonesia, from Arabic tradition, lit. "beloved, affection"
Dahyun - "Dara" - actually a poetic, affectionate, adoring way to refer to a young, unmarried female. Is somewhat old-fashioned term, used primarily in literary works (stories, poetry, etc). Quite a common name in Indonesia.
Chaeyoung - "ChaCha" - usually used as nicknames for (young) females whose names rhyme with it. "Chae" from "Chaeyoung" becomes "Cha Cha"
Tzuyu - "Juwita" - derived from "Juita", lit. "soulmate, pretty, beautiful" - a poetic, affectionate word used by a person (usually in poetry or other literary form) to address their love interest (female) and/or to describe a (young) female with extraordinary beauty. Which is, coincidence or not, really appropriate in this case.
Thank you for this answer!