Alastair is a distinctive boys' name in United States, ranking #2648 in 2022 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 2022, approximately 1 in every 34,887 boys born was named Alastair. RISING Recent data shows the name is currently rising.