I did a global search and a main forum specific search for "prius name" and "name" came up with nothing. I've always named my vehicles after astronomical names: my Prius is Aquila (the Eagle and carrier of Zues' thunderbolts)
Ours is blue so a neighbor named it Blue Angel, as in the Navy precision flying team, so we call her Angel. Funny thing is the neighbor said she loved these cars when she first saw it, and a few weeks later proclaimed she hates those Prius cars. (Her Dad works for GM)
Embarrassing enough, but my wife named it Polly. Calls it her Little Girl. I strongly suspect she has issues.....