Kaizen is a modern name taken from the Japanese word kaizen, meaning "improvement" or "change for the better", which became known worldwide as a business philosophy of continuous improvement. It fits the sound of Kayden and Kaiden while standing out through its meaning, and it was virtually unknown as a given name before the 2010s. Kaizen entered the US top 1000 in 2022 and has risen sharply to number 364 in 2025, its best rank yet.