Lyndsee, of uncertain origin, is believed to have been created as a respelling of Linda, meaning "beautiful". It gained popularity in the United States during the mid-20th century but has since become less common. The name Lyndsee is often associated with the idea of beauty and grace due to its presumed derivation from Linda.
"Lyndsee as a name gained some traction with 5 births in 1979, peaked at 20 births in 1987, and remained consistently popular from 1982 onwards with yearly totals ranging between 6 to 20. However, it seems the name's popularity began to wane after 1997, dropping below 10 births per year from then on. Overall, Lyndsee has been a relatively uncommon name over the decades, with a total of 311 babies named Lyndsee born between 1979 and 2009."