Alastair is a distinctive boys' name in United States, ranking #2518 in 2016 with 50 recorded births. The name reached its all-time peak in 2025 with 67 births ranking #2147. Since 1996, the popularity has increased by 194.1%. In 2016, approximately 1 in every 37,944 boys born was named Alastair. RISING Recent data shows the name is currently rising.