The "Name" field in information_schema's INNODB_TABLESPACES_ENCRYPTION table supposedly refers to a path name. However, there seems to be at least one "special" value used in this field--"innodb_system":
I assume that this special value refers to the system tablespace, as defined by innodb_data_file_path (usually ibdata1). However, if it is, it does not appear to be documented:
If any other special values are also used in this table, then those should probably also be documented.