Nguyên is also used as a feminine name in Vietnamese. However, it's more common for males. So, I think that the "Gender" of this name should be changed from "Masculine" to "Masculine & Feminine".Source: https://forebears.io/forenames/nguyen
A famous bearer of Nguyen (as a surname anyway) are reporter Leyna Nguyen, actress Anh Thu Nguyen Thi, photographer Thao Phuong Nguyen, polimetrician Linh Nguyen, actor Dustin Nguyen, general Van Thieu Nguyen.
Scenario 2: How do you pronounce your name?!