Lampetia has an obviously 'shining' name (from lampo, 'to shine'), and this is fitting for two of the best known: the daughter of Helios (the sun) who became the wife of Asclepius, and the daughter and chief herdswoman of Hyperion (which name see for its 'sun' link). Perhaps the latter half of the name is etos, 'year', so that she is the 'brightness of the year'.