Meaning and Name Origin
Nessie \n(es)-sie\ as a girls' name is of Greek origin, and the meaning of Nessie is "lamb". Diminutive of Agnes. Also the name in cryptozoology, of the purported monster in the Loch Ness in the Scottish Highlands, which derives its name from Scottish Gaelic Loch Nis.
For more on this name, see also the related girl name Vanessa.
Nessie has 1 masculine form: Chessie.
Nessie is an unusual first name for females. Nessie is an equivalently uncommon last name too for all people. (2000 U.S. Census)
Below is a graphed comparison of the popularity of the girl name Nessie and corresponding names. Popular related forms of Nessie (#unlisted) ranked in the Top 1000 are Aggie, Agnes, Neta and Vanessa (#171 in 2014). Usage of these girl names was at its peak during 1950-1959 and is now much lower, with the forms Agnes and Neta becoming less stylish. Vanessa (#171) is the most chic name for newborns in this compilation. (2014 Birth Statistics)