Both my FI and I have names that could easily be spelled more than one way, and usually neither one of us minds too much when someone we don't really know gets something wrong, it happens. However, I received a Save the Date from a good friend today (we are both in her wedding), and FI's name was spelled completely wrong. I actually laughed because I couldn't believe it, she's known my FI even longer than I have, and yet she & her FI didn't stop to think how his name was spelled. Personally, I feel like it's lazy, I spent a couple hours facebook-stalking someone of FI's extended family to double-check spellings.
I didn't say anything to her, hopefully she'll notice when she gets our save the date next week!
Edited: Typo