I think the island was named for the lighthouse.Hard to tell which came first, the hen or the egg.

http://www.btinternet.com/~k.trethewey/pharos1.html

http://unmuseum.mus.pa.us/pharos.htm

Pharos was the name of the island first. According to Liddle and Scott (http://makeashorterlink.com/?T187144E) the island is mentioned by that name in the Oddyssey, long before the famous lighthouse was built.

Bingley

Thanks, Bingley. Old Odysseus sure was a lousy navigator, wasn't he.
Twenty years to get home, and he hit every other port in the Mediterranean
before he could find Ithaca.

well.. dinosaurs were around a bit.. so I'd say the egg was first

Here is URL to a site that gives map of Pharos Island, with location of the lighthouse. You have to scroll down and click on Guide to historic locations:

http://ce.eng.usf.edu/pharos/alexandria/history/

Another site with a lot of information about Pharos. Name said to have orginally= Pharoah's

http://ce.eng.usf.edu/pharos/wonders/pharos.html