A modern blend of Jan and Anthony
Janthony is a contemporary American portmanteau, likely created by combining the prefix Jan- with the classic name Anthony. While Jan can have roots meaning 'God is gracious,' and Anthony means 'priceless one,' this specific combination is a modern invention without a singular historical etymology.
Less common today
Janthony isn't in the latest US Top 1000. It last peaked at #6,433 in 2012.
US births per 5-year period, 1990βpresent (SSA data).