In order to keep the number of categories somewhat manageable, I have decided to group some regions together.  The categories can be defined as follows:

North American:  all Native American traditions, including Navaho, Hopi, Lakota, Haida, Inuit and Eskimo

Central and South American:  the Aztec, Mayan, and Incan cultures

Western European:  encompassing the Celtic traditions of the British Isles and Gaul (modern-day France) and Spain

Norse:  the Scandinavian countries (Norway, Denmark, Sweden, Iceland) as well as a few Teutonic (German) deities

Eastern European:  the Baltic states, the Slavic regions, Gypsy, Turkish, and Russian

Greek:  the classical Greek world

Roman:  the classical Roman pantheon and the ancient Etruscans

Egyptian:  deities of the ancient Egyptians

African:  includes all African countries except Egypt, plus African-inspired traditions, such as Vodoun, Candomblé, and Santeria

Middle Eastern:  Akkadian, Babylonian, Sumerian, Persian, Aramaic, Judaic, and pre-Islamic

Hindu:  Vedic and Hindu deities

Southeast Asian:  Chinese, Japanese, Buddhist, Korean, and Tibetan

Polynesian:  including Aboriginal Australian and myths from the South Pacific (New Zealand, Fiji, Tahiti, the Philippines, Indonesia, Samoa, and Hawaii)