Any experienced family historian knows how helpful an obscure name can be. We'll get only a few records when searching for rare surnames like Farah or Clutterbuck, whereas a search for John Smith will return hundreds of thousands of records (around 450,000, to be more exact). Middle names can help to narrow down broad search results - for example, there are only seven John Smiths in our collection with the middle name Pepper. But what about double-barrelled surnames? The trickiness of double-barrelled:…