The name Riaan is a boy's name meaning "little king". Riaan.
From the experts:
South African adventurer Riaan Manser introduced this name to the American and European world. After bicycling the entire coast of Africa and rowing with his girlfriend from Morocco to New York, he wrote books about his travels and made his name famous. Riaan was also the baby name choice of Bollywood stars Genelia D'Souza and Riteish Deshmukh. It debuted on the US popularity list at Number 926 in 2015, when it was the fastest-rising name of the year. Nonetheless, be prepared to correct people on the spelling.