Okay so I won't get into the discussion, but I do want to point out that the word "allah" (as in the letters that make up the name) mean the same thing as the word "elohim." Allah is the Arabic translation of Elohim.
That's all I'm saying (and in case anyone is wondering, no, I do not believe in the deity of the Islamic god because I believe in the deity of Jesus the Christ). But it is really, really good to study the origins of Islam to understand that the Koran and Islam itself have mostly the same stories and characters as the Bible and Christianity, but they were translated into a different language and with a different "revelation" so they came out differently. And of course, the key is that they do not believe Jesus is Lord.
But as for the word "Allah".... it means Elohim. That sorta means that if you are a non-Western Christian acknowledging the God of the Bible in an Arabic language, you'd probably call him Allah because that's your native tongue.