J. K. Rowling recently posted on Pottermore about the history of the Harry Potter family.
The article reveals that there was a Harry Potter before our beloved and well-known Harry Potter!
Occasionally, a Potter made it all the way to London, and a member of the family has twice sat on the Wizengamot: Ralston Potter, who was a member from 1612-1652, and who was a great supporter of the Statute of Secrecy (as opposed to declaring war on the Muggles, as more militant members wished to do) and Henry Potter (Harry to his intimates), who was a direct descendant of Hardwin and Iolanthe, and served on the Wizengamot from 1913 - 1921. Henry caused a minor stir when he publicly condemned then Minister for Magic, Archer Evermonde, who had forbidden the magical community to help Muggles waging the First World War. His outspokenness on the behalf of the Muggle community was also a strong contributing factor in the family’s exclusion from the ‘Sacred Twenty-Eight’.