The name "Walden" is most famously associated with Walden Pond in Massachusetts, which was the setting of Henry David Thoreau's book "Walden". This book is a reflection on simple living and nature, and its title may have inspired some people to name a bookstore after it.
However, it's possible that a small, local bookstore may exist with the name "Walden". If you are interested in finding a bookstore with this name, you could try searching online or asking local booksellers in your area.