Sire is an English word name taken from the Old French sire, "lord" or "master", the title by which a king was addressed and, in the countryside, the word for the father of a foal. It belongs to the group of regal word names such as King, Prince and Messiah that have grown in American use since the 2000s. Sire has stayed outside the US top 1000, reaching number 1230 in 2020 and standing at number 1475 in 2025.