How to get current page menu item ancestor name wordpress

I would like to know how to retrieve as variable the name of the current page. For exemple, My menu is like :

Item 1
Item 2 => sub-item 1

Item 1 & 2 are custom links. sub-item1 is my page.

When I'm on this page, I want to retrieve "Item 2" name (to build my custom breadcumbs)

Thanks

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