The verb πράσσω (prasso), to do or act, and the substantives πρᾶγμα (pragma), πρᾶξις (praxis), business, were fertile in derivatives.
    The Christian interest of the words from this source is through Praxedes, who, according to the legend, was the daughter of the house in which St. Peter lodged at Rome, and devoted herself, together with her sister, to attending on Christians in prison, and burying them when they were put to death; a course of life that resulted in a glorious martyrdom.  In honour of these two faithful women was built one of the first churches of Rome, consecrated, it is said, as early as 141, and still existing in all the glory of its ancient mosaics. (History of Christian Names, Yonge, 1884)