Unless it has a different origin in Germany, I'd say not likely used. In the US
Lynn started getting used as a first name from the transferred use of the surnames
Lin,
Linn,
Lynn, which are both from Irish and Welsh surnames meaning lake.
Linn Boyd (1800 - 1859) was an American politician who may have popularized it (also spelt
Lynn a lot in newspapers). He was named after his Irish mother's maiden name.