Isiah is a spelling variant of Isaiah, the Hebrew name Yesha'yahu, meaning "the Lord is salvation" or "God saves", borne by the great prophet whose book is quoted throughout the New Testament. The shorter spelling is strongly associated with basketball Hall of Famer Isiah Thomas. Isiah ranked number 343 in 2000, peaked at number 336 in 2001 and left the top 1000 in 2016; it stands at number 1480 in 2025, while Isaiah remains a top 100 name.