You think it’s irrelevant clearly, others would disagree. Many surnames give the game away… Patronyms like Johnson, Anderson, Ferguson, Benson, Davies, McDonald, MacCormac, Fitzwilliam: male name surnames like Henry, Arthur, Charles, Norman, Stanley, Howard, George, Neil, Alexander, Adams, Edwards, Andrews, Peters, Johns, Matthews, Jacobs, Williams; male occupation names like Smith, Miller, Chandler, Taylor, Mason, Baker (vs Baxter), Brewer (vs Brewster) etc.
As does the word surname itself - meaning sire name…