Alastair is a distinctive boys' name in United States, ranking #3091 in 2014 with 36 recorded births. The name reached its all-time peak in 2025 with 67 births ranking #2147. Since 1996, the popularity has increased by 111.8%. In 2014, approximately 1 in every 53,346 boys born was named Alastair. RISING Recent data shows the name is currently rising.