Alastair is a distinctive boys' name in United States, ranking #3997 in 2010 with 25 recorded births. The name reached its all-time peak in 2025 with 67 births ranking #2147. Since 1996, the popularity has increased by 47.1%. In 2010, approximately 1 in every 76,736 boys born was named Alastair. RISING Recent data shows the name is currently rising.