It was her nickname back in elementary school. She couldn’t quite write her first name correctly, so she used "Wen" followed by two radical dots (known as "Dian" in Chinese). those two dots are actually one of the strokes in the character for "Yifan".
https://weibo.com/7834464486/Pf08S4oCd
https://x.com/onlyforbjt/status/1892110928658718935?t=GNPEDRJwSCkwNp3-h0sESw&s=19
https://x.com/onlyforbjt/status/1891347693642911908?t=osrQ0JGvlBPXXvu65FL8Jg&s=19
https://x.com/shengjianbaozis/status/1891903232391213105?t=1vxyQiu3o1sp479HTRtRTg&s=19