If Ivy and Ava are so popular, why not Iva?

Iva is a lost vintage name that was once mildly popular in America. Originally from Ivana, meaning "God is gracious," from the male form Ivan, which is an international variant of John (which means Iva is a version of Jane). In 2011 there were 58 girls named Iva. (Ida was not too ahead, with 92 births in 2011, and similar three and four letter vintage names were around the same ranking - Ama with 10 births, Alva with 13).