What is the X in X-mas?
"a frog, a toad," c.1300, diminutive of pad "toad," from Old Norse padda; common Germanic (cf. Swedish padda, Danish padde, Old Frisian and Middle Dutch padde "frog, toad," also Dutch schildpad "tortoise"), of unknown origin and with no certain cognates outside Germanic.
"an enclosure," 1620s, alteration of Middle English parrock, from Old English pearroc "enclosed space, fence" (see park (n.)). Or possibly from Medieval Latin parricus (8c.), which ultimately is from Germanic.