Actually, the names of almost all of the members of the autoclub are the names of model companies in Japan. Anyway...
Here's my take on the whole marking things...
The marks on their cheeks are simply to denote that they are a diety. That is why Chrono, Ere, and X have those.
Belldandy, Urd, Skuld, and Peorth all have a mark on their forehead. This is because all four of them operate on the mortal plane. During the "Lord of Terror" arc in the manga, several interesting facts were revealed about the markings. First, they are obviously a ranking system. For example, when Urd "turns to the dark side," her triangle seperates into two slashes, just like Mara's symbol. Furthermore, it may be that the number of sides to the symbol symbolizes power level. Belldandy and Peorth, as goddesses First Class, both have 4 sides to their symbol. Urd has 3, and so does Skuld. This fits with the movie, since Celestine, who was Belldandy's mentor had 6! The Earth Spirit's encounter with a Mara possessed Megumi also bears out this theory, since he knew what Mara was as soon as he saw her forehead marking.
Secondly, their emblems are their connection to the power flow provided by Yggdrasil. They also function as limitters, as displayed by Bell breaking her seal and the symbol changing. After Yggdrassil crashed and Urd was becoming a little girl while Skuld was becoming an adult, Belldandy explains some of this.
Sorry for being so long winded.
13-Feb-2005