Finnigan is a distinctive boys' name in United States, ranking #8603 in 2001 with 7 recorded births. This places Finnigan in the bottom 30% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2016 with 103 births ranking #1590. In 2001, approximately 1 in every 277,547 boys born was named Finnigan. FALLING Recent data shows the name is currently falling.