Christmas Day or birthday
Natalea is a variant of Natalia, which is derived from the Latin phrase 'dies natalis' meaning 'birthday'. Historically, the name was often given to children born on Christmas Day, celebrating the birth of Christ. This specific spelling is a modern elaboration of the traditional form.
Less common today
Natalea isn't in the latest US Top 1000. It last peaked at #5,692 in 2005.
US births per 5-year period, 1990βpresent (SSA data).