Sixth
Derived from the Latin name Sextus, it was traditionally given to the sixth child or a child born in the sixth month. It has been borne by five popes, though the spelling Sixtus is more common in ecclesiastical contexts.
Less common today
Sixto isn't in the latest US Top 1000. It last peaked at #2,190 in 1994.
American singer-songwriter known as Rodriguez
Major League Baseball outfielder
Professional baseball pitcher
Filipino election official and lawyer
US births per 5-year period, 1990βpresent (SSA data).