From Greek φερνή. See also s.v. prny #2. Note that unlike related borrowings of the same Greek term in Syriac, in Jewish texts this always(?) seems to refer to funds coming from the husband rather than the bride's family. According to see BDAG, both meanings can also apply in Greek, although "dowry" is more common. Note, too, the cited passage from TN Gen34:12 where ketubbah is listed separately.