Can anyone point me on how-to find when someone changed their name.
Hi Susan. There is no simple answer to your question. Sometimes in the 19th/early 20th century someone would put an advert in the local newspaper stating that henceforth X would be known as Y so you could check that route. Also not all people who changed their name did so legally - they just decided to start using a different name. In the same way, many people were married for a second time without a formal divorce because they could not afford the large legal costs at that time.
Best of luck, John