PreviouslySerializedAsAttribute class

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field)]
public class PreviouslySerializedAsAttribute : Attribute, _Attribute

Indicates that an instance field or auto-property was previously serialized with a different name, so that values serialized with the old name will be properly deserialized into this member. This does the same as Unity's FormerlySerializedAs attribute, except it can also be applied to properties.

public PreviouslySerializedAsAttribute(string name)

public string Name { get; }