I have no idea why it's not more popular. Maybe it sounds too clunky to some people? It doesn't roll off the tongue the way
Isabella does, for example.
Anyway, I like it. I think
Mattie, Tillie/Tilly, and
Tilda are fun nicknames. I think it sounds smart. IDK, it's just an all around positive name for me.
Hmm. Your ideas are intriguing to me, and I wish to subscribe to your newsletter.