AVRO-3335 Evaluate input of GenerateNames

[KyleSchoonover]

Additionally updated naming since it does not need to preserve Java like naming.

Jira

• My PR addresses the following Avro Jira issues and references them in the PR title. For example, "AVRO-1234: My Avro PR"
  • https://issues.apache.org/jira/browse/AVRO-3335

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• My PR adds the following unit tests: Test that method throws new exception

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[martin-g]

Thank you, @KyleSchoonover !