Alastair is a distinctive boys' name in United States, ranking #5301 in 2000 with 13 recorded births. The name reached its all-time peak in 2025 with 67 births ranking #2147. Since 1996, the popularity has decreased by 23.5%. In 2000, approximately 1 in every 151,072 boys born was named Alastair. RISING Recent data shows the name is currently rising.