Ho, Ho, Ho!
The three reindeer that have a name beginning with "D."
Who are Dasher, Dancer, and Donner?
The edible properties often built and decorated during Christmas.
What are Gingerbread Houses?
The phrase shouted during a popular card game, if you don't have the card another player's asking for!
What is "Go Fish"?
From A Christmas Carol: "Bah..."
"Bah humbug!"
The three patron saints of Ireland (name any of the three -- one has a famous holiday)!
Who were St. Patrick, St. Brigid, and St. Colum Cille (Columba)?
The two other most popular names for Santa Claus.
What are "Saint Nick / Saint Nicholas" and "Kris Kringle"?
The fruit mentioned by name in the poem Twas the Night Before Christmas.
What are sugar plums?
This hugely successful property-management board game was originally developed as an anti-capitalist game, and titled "The Landlord's Game."
From How the Grinch Stole Christmas:
"Maybe Christmas doesn't come from a store. Maybe Christmas, perhaps..."
"...means a little bit more."
The author and playwright behind "The Picture of Dorian Gray" and "The Importance of Being Earnest".
Who is Oscar Wilde?
The country that began the practice of putting up Christmas trees.
What is Germany?
The four main food groups, according to Buddy the Elf.
What are candy, candy canes, candy corns, and syrup?
The first commercially successful video game, developed by Atari in 1972.
What is Pong?
From Home Alone:
"Merry Christmas, ya..."
"Merry Christmas, ya filthy animal!"
The language from which the word "whiskey" derives.
What is Irish? ("fuisce!")
The animal-product material first used to make artificial Christmas trees.
What are goose feathers?
The original name for Eggnog, which is believed to come from medieval European tradition.
What is "posset"?
The resource-gathering and trading game so popular, it led board game designers to describe time before and after its publishing as "B.C." and "A.C."
What is Settlers of Catan?
From A Christmas Story:
"At Christmas..."
"...all roads lead to home."
The ancient Latin name for Ireland, meaning "land of winter".
What is "Hibernia"?
The first song played in space, which also happens to be a holiday favorite.
What is "Jingle Bells"? (Aboard NASA's Gemini 6A!)
The period of American history during which leaving out cookies & milk became popular, as a means of teaching children about generosity during tough times.
What is The Great Depression?
The best-selling video game of all time, released in 2011 (at 350 million copies)!
What is Minecraft?
From It's a Wonderful Life:
"Remember, George. No man..."
"No man is a failure who has friends."
The discipline / field of research concerned with the study of names.
What is "Onomastics"?