Adeline has a lovely, old-fashioned "Sweet Adeline" charm, but has become so popular in the US under so many spellings and variations — with Adalynn and Adalyn also popular — that considered together it is far more popular than it first seems. Adorable nickname Addie is also pervasive.

While Austin is a popular boys' name, this spelling, honoring novelist Jane, nudges the name toward gender-neutral, chosen last year for 67 baby boys and 57 girls.

Distinctive, elegant, and luxurious, Adalia can be a variation of Adele, or a Hebrew name with a Biblical background. Although it is given exclusively to girls in the US, in the Bible it is masculine. The similar Adlai might be easier to wear for boys in English speaking countries, while Adalia fits in with Adeline, Amelia, and Dahlia.

The sweet old-fashioned Adeline is one of the prime up-and-coming vintage baby names; Addilynn is a phonetic spelling.