FRANKFURT—Deutsche Bank said on Friday that it would nominate Dutch businessman Alexander Wynaendts as the next chairman of its supervisory board, marking a new era for Germany’s largest lender. The former chief executive of Aegon will succeed Chairman Paul Achleitner, one of Germany’s most prominent bankers. He plans to step down in May after 10 difficult years that saw two chief executive changes, billions of euros of losses, and huge fines. The European Central Bank has been pressuring Deutsche Bank to name a candidate so that it can have time to vet them and provide for an orderly transition. “Alex Wynaendts has exactly the right personality and skills to ensure a continued trustful working relationship between both boards at Deutsche Bank,” Achleitner said in a statement. Achleitner’s departure will mark the end of particularly turbulent decade for Deutsche Bank. The bank has returned to profit, but remains under the close …