Alastair is a distinctive boys' name in United States, ranking #2312 in 2023 with 60 recorded births. The name reached its all-time peak in 2025 with 67 births ranking #2147. Since 1996, the popularity has increased by 252.9%. In 2023, approximately 1 in every 28,476 boys born was named Alastair. RISING Recent data shows the name is currently rising.