Quick answer
Lynn is a boy/girl name meaning "lake".
Meaning and history
From an English surname that was derived from place names, themselves from Welsh llyn meaning "lake". Before the start of the 20th century it was primarily used for boys, but it has since come to be more common for girls. In some cases it may be thought of as a short form of Linda or names that end in lyn or line.
Notes and context
Usage: english