(Optional) The name of the foreign key column for the map key. The table in which it is found depends upon the context.

• If the join is for a map key for an element collection, the foreign key column is in the collection table for the map value.
• If the join is for a map key for a ManyToMany entity relationship or for a OneToMany entity relationship using a join table, the foreign key column is in a join table.
• If the join is for a OneToMany entity relationship using a foreign key mapping strategy, the foreign key column for the map key is in the table of the entity that is the value of the map.

Default (only applies if a single join column is used.) The concatenation of the following: the name of the referencing relationship property or field of the referencing entity or embeddable class; "_"; "KEY".

public string Name