There are 5 places named Oya in Japan.
All places in the world called "Oya".
Ono (18)
Ota (17)
Hongo (16)
Minato (15)
Wada (15)
Hama (14)
Ohama (14)
Tomari (14)
Kawasaki (14)
Nakamura (13)
Oshima (13)
Hara (13)
Nagahama (13)
Yoshida (12)
Okubo (12)
Sakai (12)
Kawaguchi (11)
Funakoshi (11)
Shinden (11)
Seto (11)
Okawa (11)
Kanayama (11)
Hirose (11)
Nakayama (10)
Takata (10)
Oura (10)
Otani (10)
Shirahama (10)
Ichiba (10)
Ikeda (10)