In fact, there is also a Hagia Sophia in Istanbul, Turkey, which is the chief cathedral of the Orthodox Church! The one in Harbin was built later and had the same name.
Sophia
Original from Greek (meaning "wisdom"), it is a philosophical concept related to knowledge, mastery, skill and strategy. The ancient Greeks believed that true wisdom was possessed only by the gods, and that mortals could only strive to obtain it in order to become "those who love wisdom" (philosophos in Greek) - a view that seems to have originated with Pythagoras. In the teachings of later Gnosticism (the roots of Gnosticism are earlier than Christianity, including Judaism and the "heresy" of Gnosticism itself, active in the 2nd century AD), Sophia was revered as a Man and a symbolic deity; in Christianity, human wisdom, like divine wisdom, is merely a symbolic reflection of God.
In Christian saint legends, there is the legend of Saint Sophia (Sapientia in Latin). Here Sophia is the saint of the three theological virtues (that is, the three virtues of God: faith, hope, and love). Mother, it is said that these three sons were executed by the ancient Roman Emperor Hadrian (117-118 AD).