I create the api in "Api-gateway" and set "API Key Required" to true in Method execution settings , But in lambda function i only get the "apiKeyId" from the request header. Is there any way to get the apiKeyName too?
In short, the ApiKey name is not available within the executing lambda. You can only use the SDK to query all keys and then filter manually with code.
On a side note, you can also do this in a custom authorizer and map the name to the invocation context. This way you only have to code it once and all lambdas get the parameter as a context variable. Another bonus of this implementation is, that the result of custom authorizer is cached.
nodejs implementation of custom authorizer with apikey name mapper