Chiajna is a Romanian female name, being a feminine version of "cneaz" (Knyaz).

In one version Chiajna was named after the wife of Cernică Ştirbey, a Wallachian vornic who owned the area where people from Cernavodă settled and founded the village.

Another story says that Lady Chiajna (ca. 1525–1588, Constantinople) was the daughter of Petru Rareş, the voievod of Moldavia, an illegitimate child of Ştefan cel Mare. Lady Chiajna was the wife of Wallachian prince Mircea V Ciobanul. In Romanian literature (e.g.: the novella Doamna Chiajna, published in 1860 by author Alexandru Odobescu), she is a famous and frightening female character, similar to Lady Macbeth.