Alastair is a distinctive boys' name in United States, ranking #2364 in 2024 with 59 recorded births. The name reached its all-time peak in 2025 with 67 births ranking #2147. Since 1996, the popularity has increased by 247.1%. In 2024, approximately 1 in every 29,073 boys born was named Alastair. RISING Recent data shows the name is currently rising.