Aw,
Greta is such a sweet name. It reminds me of evergreen trees, mountains, and Christmastime -- I usually don't like red and green together, but it's so pleasant and homely (in a positive sense) here. It's quite lively, too (more than
Margaret, in my opinion). I think it'll age well, too -- I can picture
Greta on a little girl or an old grandmother.
Greta is also the highest-ranked feminine name on my PNL (77% with 23 votes). I can't find anything I dislike about it. What pronunciation are you using? I personally say gree-tah, but greh-tah is nice as well.