People with the last name Gapp in Illinois
- Andy Gapp
- Anton Gapp
- Barri Gapp
- David Gapp
- Georgina Gapp
- Hazel Gapp
- Jill Gapp
- Kevin Gapp
- M Gapp
- Mary Gapp
- Maryjo Gapp
- Matthias Gapp
- Molly Gapp
- Patricia Gapp
- Paul Gapp
- Rebecca Gapp
- Renee Gapp
- Richard Gapp
- Robert Gapp
- Ruth Gapp
- Steve Gapp
- Steven Gapp
- Theresa Gapp
- Timothy Gapp
- William Gapp
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