Luna?

[DMKA]

Here's a possible theory from another board that actually seems plausible (well, aside of them looking so alike):

Noctis = Night
Stella = Star
Luna = Moon

LOVE TRIANGLE CONFIRMED
LOVE TRIANGLE CONFIRMED
LOVE TRIANGLE CONFIRMED

From the trailer

"Turns out Luna is in Altissa"
"I trust she's well?"
"Your date is waiting for you"
"She say anything?"
"She's got something for me"

You'll notice that they're all eager for Noctis but Noctis himself sounds less than pleased.

I bet Luna was that little girl from the E3 trailer we saw him running with, since we know it can't be Stella since Nomura confirmed Stella and Noctis' first meeting is the day Niflheim invades.

Luna = Old and busted arranged marriage for Noctis
Stella = New hotness