The name Lennon is an anglicized version of the Irish surname Ó Leannáin, which means "descendant of Leannán". Leannán is derived from the Irish word "leannán" meaning "lover" or "sweetheart". The name has its roots in the Gaelic culture of Ireland, where it was originally a patronymic surname.

In Ireland, the name Lennon first appeared in historical records in the 12th century, with references to individuals bearing this surname in County Galway and County Mayo. The name gained prominence during the Middle Ages, particularly among families associated with the Gaelic nobility and clans of Ireland.

One of the earliest recorded individuals with the name Lennon was Muircheartach Ó Leannáin, a 14th-century Irish poet and historian from County Mayo. His work, known as the "Annals of Connacht", is a valuable source of information about Irish history during that period.

In the 16th century, the name Lennon appeared in the Annals of the Four Masters, a chronicle of medieval Irish history compiled by the Franciscan friars of Donegal. The annals mention several individuals with the surname Ó Leannáin, indicating their involvement in various events and conflicts of that era.

One of the most famous individuals to bear the name Lennon was John Lennon (1940-1980), the English singer, songwriter, and co-founder of the legendary rock band The Beatles. Although he did not carry the name from birth, he adopted the stage name "Lennon" as a tribute to his Irish heritage.

Another notable figure with the name Lennon was Annie Lennox (born 1954), the Scottish singer, songwriter, and political activist. While not directly related to the Irish surname, her stage name is believed to be inspired by the surname Lennon, reflecting her interest in her Scottish and Irish roots.

Other individuals with the first name Lennon include:

1. Lennon Parham (born 1976), an American actress and comedian.
2. Lennon Murphy (born 1996), an American actress and singer.
3. Lennon Stella (born 1999), a Canadian actress and singer-songwriter.
4. Lennon Lacy (1999-2014), an African American teenager whose death in North Carolina sparked national attention and debates about racial injustice.
5. Lennon Gallagher (born 1999), the son of Oasis frontman Liam Gallagher, named after John Lennon.

While the name Lennon has Irish origins, it has gained global recognition and popularity, particularly in the English-speaking world, due to the fame of individuals like John Lennon and the enduring influence of Irish culture and heritage.