How old is the name Lennox?

The name Lennox is very old as a place name and surname, dating back many centuries, but relatively new as a first name for babies. As a place name, Lennox refers to the historic Lennox district in Scotland around Loch Lomond, and the name comes from Scottish Gaelic Leamhnach meaning elm grove, with records of the Earldom of Lennox dating back to the 12th century around 1170s when the first Earl of Lennox was documented, making the place name over 850 years old. As a surname, Lennox has been used since medieval times in Scotland for families from that region, including the Clan Lennox and the Dukes of Lennox who were prominent in Scottish history from the 1300s onward, so as a surname it is about 800 years old. As a first name for children, Lennox is much newer, only becoming popular as a given name in the late 20th and early 21st century, particularly since the 2000s as part of the trend of using surnames as first names, so as a first name it is about 20 to 30 years old in common usage. So the name Lennox as a place is over 800 years old, as a surname about 800 years old, but as a first name only about 25 years old in widespread use.