If your CRM is on premise, the following SQL query should get you the information that you are looking for:
WHERE FetchXml like '%entity name="InsertEntitySchemaNameHere"%' and FetchXml like '%InsertFieldSchemaNameHere%'
ORDER BY OwnerIdName
The query is filtered on the field in question, but also the entity in case you have fields that are named the same on different entities.
To take this a step further (if you would like to delete a view and confirm that it is not used in a dashboard) you can take the resulting UserQueryId from the query above and look for it in the UserForm (Personal Dashboards) or SystemForm (System Dashboards) views.
WHERE FormXml like '%InsertUserQueryIdHere%'
ORDER BY OwnerId
I do not have experience with FetchXML, but the query that Gerry provided looks very similar. I am wondering if removing the line with owneridename would work.
<condition attribute="owneridname" operator="eq" value="Gerry Yurko" />
<entity name="userquery" >
<attribute name="name" />
<attribute name="returnedtypecode" />
<attribute name="fetchxml" />
<condition attribute="querytype" operator="eq" value="0" />
<condition attribute="fetchxml" operator="like" value="%new_tier%" />
<link-entity name="systemuser" from="systemuserid" to="createdby" >
<attribute name="fullname" />
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