Rupee Ấn Độ
Tiền tệ comes from 錢幣
Tệ (弊) also means "bad". In modern Mandarin and Cantonese, the consonants of 幣/弊 is "b", as opposed to "t" in Vietnamese
Yes as in Renminbi (Nhận dân tệ --> 2nd and 3rd syllables mutate in Vietnamese), if it followed the standard pattern it would've become nhân mân bệ.
"What is the Indian currency" not accepted