Alasdair is a distinctive boys' name in United States, ranking #11521 in 2005 with 5 recorded births. The name reached its all-time peak in 2021 with 37 births ranking #3178. Since 1996, the popularity has decreased by 16.7%. In 2005, approximately 1 in every 399,429 boys born was named Alasdair. STABLE Recent data shows the name is currently stable.