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.
Yoo Gong's birth name is Ji-Cheol, Gong.
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