Hi Atlantia,
It is a Canary Islands `Naife', a corruption of the English word `Knife'.
These links are in Spanish but can be translated with something like Babel
http://www.terra.es/personal8/jlmmor...s-canarios.htm
And
http://armasblancas.mforos.com/933156/5569293-naifes/
Cheers
Chris