Priceless, highly praiseworthy, or from the old town
Altonio is a rare elaboration of Alton or a variant of Antonio. It likely blends the English surname origin meaning 'old town' with the Latin roots of Anthony, which refers to someone of inestimable worth.
Less common today
Altonio isn't in the latest US Top 1000. It last peaked at #5,559 in 1990.
US births per 5-year period, 1990βpresent (SSA data).