Kassia is of Greek origin, meaning 'boaster' or 'vain'. It was the name of a 9th-century Byzantine poetess and hymnographer who composed many ecclesiastical hymns and poems. Kassia was known for her intelligence, learning, and wit, and she used her talents to advocate for women's education and rights within the Church hierarchy.
The name Kassia experienced fluctuations in popularity over the years, with a notable peak in 2018 having 28 births, but generally maintaining a steady average of around 15-20 births per year since the late 1970s.