The name Londyn is a modern variant of the place name London, originating from the Latin Londinium, which was the Roman name for the city. The etymology of Londinium is uncertain, but it may derive from the Celtic words lond, meaning "wild" or "fierce," and inion, meaning "river." Alternatively, it could come from the Celtic root londin, meaning "a pool."

The earliest recorded use of Londyn as a given name dates back to the 20th century. It is an English name that gained popularity in the United States and other English-speaking countries as a feminine form of the place name London. The name's rise in popularity may have been influenced by the city of London's cultural significance and its association with sophistication and cosmopolitan living.

One of the earliest recorded individuals with the name Londyn was Londyn Mackenzie, an American actress born in 1982. She is known for her roles in television shows such as Ugly Betty and The Young and the Restless.

Another notable figure with the name Londyn is Londyn Jackson, an American singer and songwriter born in 1998. She gained recognition for her participation in the reality TV show The X Factor in 2013.

Londyn Bradshaw, an American dancer and choreographer born in 1996, is also a notable bearer of the name. She has worked with various artists and appeared on television shows like So You Think You Can Dance.

In the sports world, Londyn Gonzalez, an American softball player born in 2002, has achieved success as a member of the Oklahoma Sooners softball team.

Londyn Culbreath, an American actress born in 2006, is another individual who has brought attention to the name through her roles in films and television shows like Council of Dads and The Haunting of Hill House.

While the name Londyn has gained popularity in recent decades, its origins can be traced back to the ancient Roman name for the city of London, reflecting the enduring influence of this historic and culturally significant location.