Why: BabyNames.com says the name Gretchen comes from the German word for pearl.
Answer: As a noun:
1. PerleAs an adjective: matt
Source: Google Translate
The More You Know: The largest known pearl was found in the Philippines in 1934. It grew in a clam (not an oyster), so it has a glossy surface like a China plate. It weighs 14 lbs.