From Greek *obsidianos*, the volcanic glass, used as a nature-derived modern name.
Obsidian is named after one of Earth's most striking natural materials — a volcanic glass formed when lava cools so rapidly that crystals have no time to grow, producing a smooth, jet-black stone with edges sharper than surgical steel. The word's etymology is a happy accident of ancient scholarship: Pliny the Elder, writing in his Naturalis Historia in 77 CE, attributed the stone's name to a Roman explorer named Obsius who supposedly discovered it in Ethiopia — a claim that later scholars have questioned, but the name stuck, passing through Latin "obsidianus" into the European languages. For thousands of years, obsidian was among humanity's most precious technologies.
Mesoamerican civilizations — the Aztec, Maya, and their predecessors — used it for blades, mirrors, and ritual objects. Aztec priests used obsidian mirrors ("tezcatl") to divine the future, and the god Tezcatlipoca, "Smoking Mirror," was depicted with an obsidian mirror in place of one foot. In the ancient Near East, obsidian from Anatolian volcanoes was traded across thousands of miles as early as 9,000 BCE.
In Greek and Roman contexts it was carved into portrait busts and decorative vessels. As a given name, Obsidian is extraordinarily rare and intentionally dramatic — a word name that announces itself with full confidence. It belongs to a small category of mineral and gemstone names (alongside Onyx, Jasper, Jet, and Flint) that parents choose when they want a name that conveys both geological permanence and aesthetic distinctiveness. The name's darkness is part of its appeal: it is a name that does not attempt to be soft or ingratiating, but instead radiates a quiet, volcanic strength.