1728, from the Unami Delaware (Algonquian) native designation, said to mean literally "original person," from /len-/ "ordinary, real, original" + /-a:p:e/ "person." Sometimes in extended form Lenni Lenape, with /leni-/ "real."
lemonade
lemony
lemur
Lemuria
Lena
Lenape
lend
lender
length
lengthen
lengthways