List of fertility deities from Wikipedia.
There are about 170 of them here, from various cultures/religions, with lots of different co-associations (pregnancy, agriculture, and sex are the obvious ones; but also war, drunkenness, dance, death, disease, medicine, crafts, fire, snakes, rainbows, flowers, beauty, and virginity). If you're interested in exploring the mythical/mystical aspects of fertility, there are many interesting and unexpected options to choose from. This could be an interesting starting point.
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