Sunni is a spelling of Sunny, an English nickname-turned-name that means "sunny" or "cheerful"; the spelling happens to match the word for the largest branch of Islam, which comes from the Arabic sunna, tradition. In the United States it is used in the same cheerful spirit as Sunny and Sunday. Sunni ranked number 3261 in 2000, climbed to its best position at number 1674 in 2024 and stands at number 1960 in 2025.