My wife and I have kept our different surnames, but for our first child we're unsure which of those to give to her.
Excluding the hyphenated option, we don't mind if she gets either my surname or my wife's. All we want is to avoid making certain interactions/services cumbersome, when the family bonds aren't obvious from the names.
I mainly have in mind interactions with authorities such as checking into hospitals, or travelling. For instance, we have friends who for years have kept having to produce (expensive) notaried documents when only one of them (the one not bearing the same surname) was travelling with the child across borders.
We live in Austria now, but we are Romanian citizens (and so will our daughter). Because of our jobs, we will likely move again, to some other EU country, in a few years.
Advice from both Austrian and Romanian authorities hasn't been helpful: namely, either that this is a subjective choice that we need to make (duh!); or that one of us would be well advised to change their surnames if we want to make things easier - but without details of exactly which situations would otherwise not be easy. At this point it wouldn't be optimal for either of us to change our surnames, but ultimately we'd consider it, to avoid the kind of hassle potentially up the road.
Ours is certainly not an uncommon situation. Indeed, I found a similar question on here, but I think the answer to mine would rather address potential scenarios of complications that can arise in such a situation within any EU country, or during travel between them.
Thanks for any opinions!