Loudon is a distinctive boys' name in United States, ranking #10951 in 2005 with 6 recorded births. This places Loudon in the bottom 18% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2010 with 14 births ranking #6244. In 2005, approximately 1 in every 332,858 boys born was named Loudon. FALLING Recent data shows the name is currently falling.