Alasdair is a distinctive boys' name in United States, ranking #4358 in 2018 with 23 recorded births. The name reached its all-time peak in 2021 with 37 births ranking #3178. Since 1996, the popularity has increased by 283.3%. In 2018, approximately 1 in every 78,934 boys born was named Alasdair. STABLE Recent data shows the name is currently stable.