Hey! My Lavellan's name is Tala, too! *fist bump*
I picked it cuz' of the Native American meaning being wolf, which I thought fitting due to her role as a huntress, coupled with the wolf on the rogue tarot card. And this was before I knew anything of Solas' true identity. Pfff. It hits me right on the irony bone.
Plus, it's a pretty name. :3
(Still catching up to the thread and I'm currently having a haircut

)
*fistbumps*

Mine is a huntress too. xD
I picked that name because I wanted something related to my culture.

'Tala' is the goddess of the stars in Philippine mythology and her name also means "bright star" in Tagalog. If ever I make a tarot card for my Lavellan, I'd probably use The Star tarot card as a basis for the design.
I find it interesting that her name has other meanings in different languages. Apparently it means "palm tree" in Arabic and "gold" in Persian.

*goes back to catching up on the thread*