Artiga is an Occitan and Catalan name, coming from
Our Lady of Artiga de Lin (Es Bòrdes, Aran Valley). The place name
Artiga comes from the Occitan, Catalan and Aragonese word
artiga, "slash and burn" (
http://ca.wikipedia.org/wiki/Artiga), from pre-Roman origin.
If the girl was not Occitan or Catalan, it is possible that
Artiga was a transferred use from the surname
Artiga, present in Spanish, Aragonese, Occitan and Catalan, with the same etymology that the cited one.
Lumia
http://onomastica.mailcatala.com