Avatar The Last Airbender

A well-used name in China that has some potential for assimilation.

Rafa is an adorable short form introduced to the world by actors Rose Byrne and Bobby Cannavale, who used the name for their second son. Rafael is the Latin cognate of the Hebrew boys' name Raphael, but you don't need to be a Rafael to be a Rafa.

Riley -- one of the most popular unisex names -- is trendier now for girls though for boys it's a classic, ALWAYS ranking in the US Top 1000.

A pan-European short form often used as a name in its own right, Rina is sister to names like Mina and Lena, popular at the end of the 19th century and showing their pretty if slight faces again. In the Netherlands, Rina itself is sometimes shortened to Rineke, as Tina may become Tineke.