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.
Yoo Gong's birth name is Ji-Cheol, Gong.
Ah In Yoo's birth name is Eom Hong Shik.
Teo Yoo's birth name is Tschi-Hun Kim.
Yoo Jung Han's birth name is Yoojung Han.
Yoo MAMA
yoo maa
yoo hoo
Bratian yoo
Poland is the best country yoo
no yoo cant
yoo-naygst. it kinda sounds like "youre next" but not exactly. or think of it as rhyming with thanks, but with a T on the end. easiest way to say it though is YOO-NAY-GST :) i know because its my last name. :) i have been called so many things and it seems like nobody knows how to say it haha its german