In German, the words Christmesse oder Christmette, obviously closely related to "Christmas", still exist but they only refer to the church service held at Christmas or, more specifically, the Hours themselves sung during the night of Dec. 24th.
The holiday is referred to as Weihnachten from Middle High German wīenacht which just means "holy night". More interestingly though, the singular form Weihnacht is, at least where I live, rarely used and sounds to my ears old-fashioned and/or poetic. When people refer to the holiday they use the dative case plural Weihnachten, which is holdover from the MHG phrase "ze wihe nachten" at/during the holy nights, inferring that there wasn't just one but several. It sorta makes sense since there are three liturgical holidays or if you think of the Twelve Days of Christmas but I like to think that this is a holdover from pagan times when they had multiple winter solstice feasts from late Fall into February.
Anyway, the more I learn about Christmas the more pagan it seems. If you live in the Northern Hemisphere, past, say, the 45th parallel, it's easy to see why people would do *anything* and call on any and all Gods or Ancestors for any number of nights to make the dark time of year more enjoyable. Happy Winter Solstice and many Holy Nights to everyone!