It has grown on me too to the point where I can see myself using it. I still find
Lilia to be prettier, but Lydia/Lyddie is far less common than Lilia/Lily and probably more sophisticated. For me, the Biblical and literature references also add to the appeal of
Lydia. It's funny, for
Sylvia I prefer the
Silvia spelling but for
Lydia I don't like
Lidia...