Initially, the strip was based largely on Guisewite's own life as a single woman. "The syndicate felt it would make the strip more relatable if the character's name and my name were the same," Guisewite said in an interview. "They felt it would make it a more personal strip, and it would help people to know it was a real woman who was going through these things. I hated the idea of calling it 'Cathy.' Guisewite had Cathy's longtime boyfriend Irving propose marriage on Valentine's Day 2004. The two characters married in the February 5, 2005 strip. That same year, Cathy appeared in the 75th anniversary party of Blondie and Dagwood.