Lyndon is of Welsh origin and means "leader". It was brought to prominence by Lyndon B. Johnson, who served as the 36th President of the United States from 1963 until 1969. The name has been used steadily in English-speaking countries since then but remains somewhat less common than many other names of Welsh origin. In its most traditional form, it is pronounced /ˈlɪndən/. However, some people have adopted the American variant pronunciation /ˈlaɪndən/, possibly due to Johnson's influence. The name Lyndon does not typically have any popular diminutives or nicknames.
"The name Lyndon experienced a significant surge in popularity starting around the late 1990s, with peaks in recent years such as 2017 (31 births) and 2018 (35 births). However, it initially saw consistent usage between 1934 to 2008, with several years having 6 or more births. Interestingly, there was a notable spike in popularity in 2015 and 2016, both seeing 24 births each."