Incoming Call showing double name(Old name and new name)

Hello, I managed my contacts list. I faced a problem. For example I changed name of "mothe"r to "name and surname". But now, incoming calls showing doble name. Even, I deleted all contact in my simcard. and I only switched on gmail contacts. rest of contacts souces switched off such as icloud,outlook etc.When I check with her number in contact list, i see only one "name,surname" in her phone number. but when incoming Call showing double name as well. "Mother or name surname" calling

Thank you for quik support.

Best Regards

Tayfur