Sidney

From the English surname Sidney. It was first used as a given name in honour of executed politician Algernon Sidney (1622-1683). Another notable bearer of the surname was the poet and statesman Sir Philip Sidney (1554-1586).

As a given name, it has traditionally been more masculine than feminine. In America however, after the variant Sydney became popular for girls, Sidney was used more for girls than boys between 1993 and 2019.