From Japanese 里 (ri) meaning "village", 愛 (a) meaning "love, affection" or 亜 (a) meaning "second, Asia" combined with 菜 (na) meaning "vegetables, greens" or 南 (na) meaning "south". Other kanji combinations are possible.
Derived from Hungarian rianás, a word denoting an ice crack, specifically a thermal crack that forms on ice covering a body of water as well as the event of such a crack forming, typically accompanied by a distinctive sound.