Name meanings can vary depending on the kanji and some kanji for this name are a quick "yu" and some are a longer "yuu".
Here are some possibilities: "yu" -freedom -together/friend (rare... this character's usually pronounced "tomo") -bear (produce... like to produce fruit) -kind/smart -play
Two famous people that bear the name Yuko are: Yuko Nakazawa, solo artist of Hello! Project and former member of Morning Musume. Yuko, the space and time witch from Tsubasa: Resovoir Chronicle By CLAMP.