Lachlan is a distinctive boys' name in United States, ranking #606 in 2025 with 468 recorded births. The name reached its all-time peak in 2025 with 468 births ranking #606. Since 1996, the popularity has increased by 3,800.0%. In 2025, approximately 1 in every 3,650 boys born was named Lachlan. RISING Recent data shows the name is currently rising.