Views related content based same term names in different vocabulary
First option (doesn't work as expected though):

You should be able to do that, by doing the following in your contextual filter:


Check the "Specify validation criteria" option.
Select "Taxonomy term" as "Validator".
Select "Term name" as "Filter value type".


I just tried this however and it returns only one result, which is not what you need.

Alternative (this one was tested and works):

You can create a View of Taxonomy Terms, and then use a "Taxonomy term: Name" contextual filter.
Afterwards, you can add a relationship to your tagged nodes, using the "Taxonomy term: Content with term" relationship.

That way, you can get all the content tagged with a specific term name, even if the term name belongs to different taxonomies.

Here is a sample View configuration:



and a sample result-set with "ManU" used as a contextual filter:



Good luck!