I'm no physicist or astronomer, but I do think of much of unformed space in our universe or the spewing of forth from the initial white hole from which our galaxy was formed as a kind of Chaos. And the Greeks basically said that in the beginning there was Chaos, and from Chaos sprang Ouranos (Heaven) and Gaia (earth).

Also I just looked up "Chaos" at etymonline.com:

late 14c., "gaping void; empty, immeasurable space," from Old French chaos (14c.) or directly from Latin chaos, from Greek khaos "abyss, that which gapes wide open, that which is vast and empty," from khnwos, from PIE root ghieh- "to yawn, gape, be wide open."

Meaning "utter confusion" (c. 1600) is an extended sense from theological use of chaos in the Vulgate version of "Genesis" (1530s in English) for "the void at the beginning of creation, the confused, formless, elementary state of the universe." The Greek for "disorder" was tarakhe, but the use of chaos here was rooted in Hesiod ("Theogony"), who describes khaos as the primeval emptiness of the Universe, and in Ovid ("Metamorphoses"), who opposes Khaos to Kosmos, "the ordered Universe." Sometimes it was personified as a god, begetter of Erebus and Nyx ("Night").

Meaning "orderless confusion" in human affairs is from c. 1600. Chaos theory in the modern mathematical sense is attested from c. 1977.