If it's spelled as 'Yoo', mostly Korea. It's often differentiated with Yu, which is Chinese. But pronunciation will be pretty much the same. Depending on the clan/family, the last name can have variation like Ryoo.
Star Yoo's birth name is Star Byol Yoo.
Ah In Yoo's birth name is Eom Hong Shik.
Teo Yoo's birth name is Tschi-Hun Kim.
Yoo Gong's birth name is Ji-Cheol, Gong.
Yoo MAMA
Yoo Jung Han's birth name is Yoojung Han.
yoo maa
yoo hoo
Bratian yoo
Poland is the best country yoo
no yoo cant
yoo!