Alasdair is a distinctive boys' name in United States, ranking #4542 in 2020 with 21 recorded births. The name reached its all-time peak in 2021 with 37 births ranking #3178. Since 1996, the popularity has increased by 250.0%. In 2020, approximately 1 in every 82,146 boys born was named Alasdair. STABLE Recent data shows the name is currently stable.