Parents dont have surname in their passport for visitor visa

I am in US on L1 Visa and now applying visitor Visa for Parents. Query is that my parents dont have surname in their passport because they don’t have surname in all certificates but in my passport my parents name is with surname. will it cause any issue?.

When you’re filling out the visa application form for your parents, leave the surname field blank. This is because the visa processing system is designed to handle cases where there is no surname.