Tim over at SansBlogue has a fascinating post on the divine name אֵל שַׁדַּי
, El Shaddai. You should check out the comments including Tim's responses. He argues that although etymologically speaking, the name is not connected to the similar-sounding Hebrew word "breast" that at least in a few passages, a word-play on "breasts" is present. To see the post, click here
The BDB lexicon actually has the אֵל שַׁדַּי entry under the "breast" main-heading. However, BDB does list several possible meanings for the name, including the possible tie to the Akkadian term "mountain." I agree with the newer HAL lexicon that this is probably the correct etymology. El Shaddai means "the One of the [Cosmic] Mountain." El (God) is the one who dwells atop the world on the mythopoetic mountain that joins heaven and earth (cf., e.g., Ezekiel 28:14, "the Holy Mountain of God").