Not having a name
Derived from the English prefix 'un-' and the word 'name', this term is typically used as a placeholder rather than a traditional given name. It is extremely rare as a legal name and is most often found in historical records or medical contexts for infants before a name is chosen.
Less common today
Unnamed isn't in the latest US Top 1000. It last peaked at #980 in 1991.
US births per 5-year period, 1990βpresent (SSA data).