Umar is an Arabic name usually explained as "flourishing" or "long-lived", from the root amara, to live long and prosper. Umar ibn al-Khattab, the second caliph of Islam, made it one of the most respected names in the Muslim world; Omar is the more common Western spelling. In the United States Umar has risen from number 1923 in 2000 to number 1164 in 2025, its best rank so far.