Rithy, derived from Khmer origins, means 'light' or 'shining'. It's a unisex name, popular in Cambodia and among the Khmer diaspora worldwide.
"The name Rithy saw a peak in popularity with nine births each in 1984 and 1985, after which it maintained steady but decreasing popularity until the late 1990s. There was a notable resurgence in its usage in 2008 and 2013, however, with five and six births respectively."