Sar is my real first name - the "ar" pronounced like "star, car" etc. I didn't have a middle name. When my husband and I were wed, he had Adora added as a middle name. I just put the 2 together as my log in. Sar is actually an old Celtic male name. Adora is "beloved" in both Greek and Italian - my husband's native languages.
I always thought "Billboard" was chosen because BBE frequently quotes lyrics.
