Algernon \a-lger-non, al-ge-rnon\ as a boy's name is of Old French origin, and the meaning of Algernon is "wearing a mustache". The Normans were usually clean-shaven, and this was a nickname for William de Percy, a companion of William the Conqueror. It was revived in the 15th century for his descendant Henry Percy, and adopted into other families connected to them. Oscar Wilde used it for a brainless fop in "The Importance of Being Earnest". Algy and Algie are pet forms. English poet Algernon Swinburne.

Algernon has 8 variant forms: Al, Alger, Algernone, Algey, Algie, Algy, Aljernon and Allgernon.

Baby names that sound like Algernon are Elger, Allger and Algar.