Quick Find not working for particular word "Eder"

In an on-premise environment when using quick find to search for a campaignresponses by lastname I don't get a result for the name "Eder". When I change the name to "Ader" it works. I thought this might be caused by stoplist which is also mentionied here:

https://docs.microsoft.com/en-us/dynamics365/customerengagement/on-premises/admin/configure-quick-find#what-system-administrators-should-consider-before-enabling-or-disabling-full-text-indexing

I followed this guide to check the stoplist but couldn't find any stoplist in the database of my CRM organization:

https://docs.microsoft.com/en-us/sql/relational-databases/search/configure-and-manage-stopwords-and-stoplists-for-full-text-search?view=sql-server-ver15#add-or-drop-stopwords-from-a-stoplist-with-management-studio

Are there any other reasons for this behavior?