Harry Potter and The Viscount Pimlico

The ancient noble titles of Viscount Pimlico and Baron Purbeck had been extinct for ages. That was what the world knew. The Black family knew that those titles belonged to Sirius Black. They were still active but hidden as was the Black family and all wizards and witches since the seventeenth century. Is it time for them to be made public again? Was Sirius the last Black in the nob