Old business name appearing at the end of meta titles on Google – how do I get rid of it?

I’m having some issues with how meta titles are appearing on Google. Some pages have our old business name added onto the end of their meta titles, even though the old name doesn’t appear anywhere on our CMS. This is only an issue with Google, as on other SERPs they appear correctly (same meta title just without the old business name).

The old business name isn’t in the page source, and we’ve done a scan of directories for any old references and haven’t found anything, so I’m not sure where it’s picking it up from or how to amend it?

If anyone has any ideas I would really appreciate them.

Thanks!