A British depiction of Lady Justice.
Statue outside the courthouse in Memphis, TN.
It should not be surprising that both Justice and Wisdom are given a female persona. The Egyptian concept of Ma'at was personified as a woman, and in Greek, Etrustcan, and later Roman mythology Wisdom is uniformly female. In ancient Greece, as i'm sure many of you are aware, Athena is the goddess of wisdom, and she is seen as independent of any male influence, given her lack of a husband or consort. Minerva was the Roman equivalent, and she likely derives her name from the Etruscan "Minrva," as the latin "mens," means mind. The Roman Minerva seems to be a merging of Athena and this Etruscan goddess.
Justice, likewise, has long held a female persona.
