Yu means "hot water." It is usually said "oyu" with the o being a polite prefix.
Japan!!
Yu Aida was born on November 8, 1977, in Japan.
Habikino, Japan
Yu Shimaka was born on May 6, 1949, in Nagano, Japan.
Eri Yu was born on December 21, 1971, in Kanagawa, Japan.
Miri Yu was born on June 22, 1968, in Yokohama, Japan.
Yu Tokui was born on September 28, 1959, in Osaka, Japan.
Yu Minobe was born on February 23, 1990, in Musashino, Japan.
In Japan lots of people collect Yu Gi Oh! So probaly Japan.
Japan
Yu Sugimoto was born on January 29, 1975, in Suita, Osaka, Japan.
Yes, it originates from Japan.