Lynx

About Lynx
Lynx is Lyna's older sister, hence why the names sound the same and spelling.
Lore 
In LoliRock, Lynx had actually ran away from Borealis. Leaving Lyna and her own people behind, she didn't know who's Gramorr until the episode ' Seeing you again '. Lynx is actually Izsira's close friend, they've been friends since they were kids. Lynx was a popstar in Japan and went on a world tour, when Iris and the girls saw that she looked identical to Lyna. 
In LoliRock : The Power of Xun, Lyna actually had met Raze , this is a sequel before she went to earth to be a popstar. Lyna and Raze didn't have an excellent relationship, since their personalities are different.