Highest Test partnership by any two players with the same surname, whether related or not.

In 2009, the two Jayawardenes added 351 in a Test against India. It had to be a record for the highest partnership between two unrelated people with the same surname. That partnership of 351 runs between Mahela Jayawardene and Prasanna Jayawardene was Sri Lanka's 6th wicket against India in Ahmedabad in 2009-10: it is actually the highest Test partnership by any two players with the same surname, whether related or not. The preceding record was 269 runs by the Zimbabwe brothers Andy Flower and Grant Flower against Pakistan in Harare in 1994-95. The previous highest partnership between unrelated players who shared the same second name appears to be 151, by Majid Khan and Mohsin Khan, for Pakistan's 2nd wicket against Sri Lanka in Lahore in 1981-82. If you’d like to stretch bit more, then West Indies Viv Richards and Richie Richardson added 308 against Australia in St John's in 1983-84, and Darren Sammy and Marlon Samuels put on 204 for West Indies v England at Trent Bridge in 2012.