I wanted to create a replicate of my production database for staging and created the staging DB instance from a production snapshot. However, this new instance still has the Database Name: "production-database". I was able to rename the database on PSQl to "staging-databse," but this is not reflected in the AWS Console. I'm afraid that future developers will be very confused, and was wonderign how to rename the "Database Name" on AWS?
Don't use the default database option. All it does is create a custom-named database by default. There may be uses for it, but I never use it, because it seems to serve no purpose at all other than to specify what the database that's created by default (when the instance is first created) will be named.
Database Name
If you want to specify a database name for the default database, type a name for your database of up to 63 alpha-numeric characters. If you do not provide a name, the default "postgres" database is created.
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_CreatePostgreSQLInstance.html
I assume this is intended to be a convenience for new RDS users, but to me, it seems unnecessary. It has no apparent impact on ongoing operation of the instance, which can, of course, have multiple independent databases on it.
This apparently can't subsequently be changed, so it's more of an annoyance than anything. I always leave this blank.
来源：https://stackoverflow.com/questions/43099155/how-can-i-change-the-database-name-in-aws-rds-for-postgresql