It works quite well, but bear in mind that the dataset must be already quite old. Based on my ancestors extremely rare name (only family in Germany) I would say at least 15 years old – but accurate for that matter!
* my last 3 houses * my sisters uni locations (quite distinctive due to the campus location) * my family home * my dads home (post-divorce)
Our surname is uncommon and I know for a fact I'm the only one in my county, my dad in his, and my sister was the only one ever at her uni. Of course there could be others I don't know in these towns, but when we are talking <30 locations total and I know people at each of them and my immediate family accounts for nearly a third of locations...