Sadie doesn't sound like the word "sad" (if it were "Saddie", then that'd be a different story).
And I know people named Madel(e)ine who flip out if people call them "Mad" as a short form. Madeleine's not one I'd use myself so I've never really thought about disliking it for the 'Mad' part. I do like it, though, but I just wouldn't use a nickname for it. Plus, the Madeleines I've known have been French or German so the "mad" part isn't strong, whereas with Beatriste, the TRISTE part is emphasized (well, 'triste' as one syllable if you say it in French. It's not easy to ignore Spanish 'triste' either).
Also, I think words at the start of a name are more easily overlooked than at the end. Nobody ever mentions "beat" as the start of Beatrice. I don't think "beat" is particularly placid, but it also isn't pronounced like the word. But yet, a lot of times when I see Beata mentioned, there are a slew of "beat" comments, but there's just one extra letter in that case.
People don't like Violet because it's too close to 'violent'. Viola is the present 3rd person singular of "to violate" in Spanish... I still love Viola, but I don't pronounce them the same either.
It just depends what you're looking for.
Some people will overlook "triste" and others won't.
ETA: just mentioning that there are a lot of names with sad meanings, like I previously mentioned Dolores and Angustias. Sad meanings don't bother everyone.
This message was edited 10/20/2011, 6:53 AM