That depends on what you consider "God" to be.
One point to remember, though, is that Buddha is not a god. Siddhartha Buddha, who founded Buddhism, was a human being - a prince - who left everything he had to search for a way to end human suffering. The so-called "Buddha" that is fat, that many people think is Buddha, is actually Ho Tei - NOT Buddha at all. Siddhartha never claimed divinity whatsoever. He was just a human being.
That said, there are various names for God throughout different scriptures and belief systems. Some answerers have already mentioned names found in Jewish and Christian scripture. Here are a couple more:
"Jealous": Exodus 34:14 For thou shalt worship no other god: for the LORD, whose name is Jealous, is a jealous God
"Jehovah Jireh": A variation of "Jehovah", that I was taught meant "Lord and Provider", found here: Genesis 22:14: And Abraham called the name of that place Jehovahjireh: as it is said to this day, In the mount of the LORD it shall be seen.
"Eli" or "Eloi": When Jesus was on the crucifix, he allegedly said, “Eloi, Eloi, lama sabachthani?” meaning, “My God, my God, why hast thou forsaken me?” (Mark 15:34) This makes sense when you consider that "Elohim" (as found in Genesis) is actually plural. Other Hebrew words that use "im" to denote plurals are common, for example, "goyim" is the plural of "goy" (which means a non-Jew).
"Allah" has already been mentioned. Some people believe Jesus is God, therefore that is God's name. Others of different religions and cultures have different perspectives again. Hindus have many deities. Pagans often have their own deities they worship and/or work with as well. There are so many names of so many deities, there's no way they could all fit in here. A great reference is "Dictionary of Ancient Deities" by Patricia Turner and Charles Russell Coulter (Oxford Press). My copy is well over an inch thick. It's incredibly comprehensive, with not just names, but origins, cutures that worshipped each god or goddess, other names each one has been known by, mythology, and so on.
Also check out GodFinder which has quite extensive lists of different deities.
Good luck! 