Etymology

From the Old Norse friðill ‎(“a lover, a gallant”). Confer the Old Norse friðla ‎(“a mistress, a harlot, a concubine”), it's contraction frilla ‎(“a mistress, a harlot, a concubine”) (whence the Icelandic term frilla ‎(“a concubine, a mistress”)) and friðgin ‎(“which seems to mean lovers”)- a word analogous to systkin (whence the Icelandic systkin ‎(“siblings, brother and sister”) and systkini), fegðin (whence the Icelandic feðgin ‎(“father and daughter”)) and mæðgin (whence the Icelandic mæðgin ‎(“mother and son”))