My science teacher my freshman year of high school wouldn’t let us pronounce it that way, and it stuck. So when I look at this, first I hear his voice saying, “Date-ah is a name, dat-ah is information.” Then, largely thanks to this community, it’s followed by Brent Spiner’s voice saying, “One is my name. The other is not.”
My freshman year of HS was in 93, so TNG was still on the air.
Edit: decided to add a spoiler tag (for Picard season 1)
spoiler
Picard is lucky his new body wasn’t named Limerick or something.