I do not support the obs. tag.
You may laugh if it makes you feel better, but I've only ever heard it referred to as Grand Canary Island, where I interpret Island as an integral part of the name, like Mackinac Island and unlike Oahu.
I include several uses of Grand Canary Island in reputable sources below. dude and Agalinis also provided a few links, and I am sure others could be found. http://www.nytimes.com/1991/11/06/world/rober...
Spanish maritime authorities said Mr. Maxwell's body was recovered late this afternoon from calm seas about 20 miles southwest of Grand Canary Island
, following an extensive air and sea search. http://www.newsweek.com/ashes-away-173044
The "cremains," in lipstick-size capsules, are on a rocket launched from a Lockheed L-1011 airplane over Grand Canary Island
United Airlines lists Grand Canary Island in its current timetable:
LAREDO, TX (LRD)
LAS PALMAS, GRAND CANARY ISLAND
LAS VEGAS, NV (LAS)
LAUREL/ HATTIESBURG, MS (PIB)
The above timetable can be found at: http://www.united.com/CMS/UADocuments/pdfs/ti...
The Washington Post appears to prefer Gran Canaria, as several entries from 2007 show. I've included a representative one below. Probably most publications have a house style on this. http://www.washingtonpost.com/wp-dyn/content/...
On Gran Canaria
island, some 25,000 acres of woodland were charred, and 5,200 people evacuated as at least 60 homes were engulfed by flames.