My invitations are here and ready to be addressed and sent out, but I've run into a few snags while writing my guest list...For instance, my fiancee's parents have lost track of how many kids some of his aunts and uncles have, or their names, and so forth. I've also realized there are people I've known my whole life by one name, that isn't necessarily their legal name, but is the name they've always gone by regardless. There are children whose parents are divorced and I'm not sure if they've still got their father's surnames or not.
Basically, I have a base understanding of who I'm inviting, so is it okay to just write their names informally (like the friends and family they are), and assume they'll know what do from there? I will only be addressing the envelopes, the invites are as-is. And my RSVP's instruct people to just tell me how many people they're bringing, so I assume that they would assume they can bring whoever they please.
I know most brides here don't advise allowing the guests to choose who they're bringing, but I did that on purpose. My wedding guest list is small, and much of my family lives halfway across the country and won't be coming (I'm sending them invites as a courtesy). I really doubt it'll get out of hand, as generally people don't just invite all their friends and coworkers to a distant family-member's wedding.