Riko is also used as a masculine name in Japanese. However, it's more common for females. So, I think that the "Gender" of this name should be changed from "Feminine" to "Feminine & Masculine".Source: https://forebears.io/x/forenames/riko
Riko is a popular girls name in Japan.It first entered the top 10 in 2002. Since then it has fallen in and out of the top 10. It peaked at #2 in 2010. Currently (as of 2018) it is at #10.Even though -ko used to be a very common ending in girls names it has been used less and less in recent decades. Riko is currently (as of 2018) the only girls name ending in -ko in the Japanese top 100.The only three -ko ending Japanese girls names who have entered the top 10 since 1990 are Momoko, Nanako and Riko.It is most commonly spelled as 莉子 (white jasmine + child).
Riko Mizuno is a Los Angeles gallerist, art dealer, and artist. Born in Tokyo, Japan, she moved to Los Angeles in the 1950s to study ceramics at Chouinard Art Institute. Between 1966 and 1984, Mizuno operated galleries at several locations in Los Angeles.
Riko Higashio is a Japanese professional golfer and former member of the LPGA Tour. Higashio was born in Fukuoka Prefecture, Japan. As a teenager, she won the 1993 Japan Amateur Championship and the 1994 Japan Junior Championship.
Riko Tachibana is a popular award-winning Japanese adult video idol and gravure model. Taller than average, Tachibana debuted in 2003 and starred in many adult videos which emphasized her height. An extremely prolific actress, Tachibana had performed in over 200 AVs when she was awarded for Most Appearances at Japan's Adult Broadcasting Awards in 2007. Tachibana retired in March 2008.
Riko Yoshida is a Japanese child actress. She is represented by Moon the Child Agency. Her representative works includes the television series Oh! My Girl!, Hanayome to Papa and Yamada Taro Monogatari.
This can also be used for male japanese. My grandfather and me are using the same name. Ri- has the same meaning, but -ko(u)can have dozens of meanings.
Source: https://forebears.io/x/forenames/riko