SEOUL—When Catherine Germier-Hamel arrived in Seoul eight years ago with her husband, a French diplomat, the 45-year-old Parisian and French-bread lover was delighted to find outlets of a store called Paris Baguette on many street corners. “For them to call themselves ‘Paris Baguette’ here in Korea is not a problem. I’d even say it’s funny,” Ms. Germier-Hamel says. “But if there was a Paris Baguette in France, I think I would be upset.”