Ubuntu – Find file by matching on its path

I have a directory containing a number of subdirectories. Each of these subdirectories contains a subdirectory which all have the same name. I would like to produce a list of all these files on the command line. So, for example, if I have:

dir1/
    file1.txt
    subdir/
        relevant_file1.c
        relevant_file2.c
dir2/
    file2.txt
    subdir/
        relevant_file3.txt
        relevant_file4.java
dir3/
    subdir/
        relevant_file5.cpp
    irrelevant_subdir/
        unimportant_file.txt
dir4/
    subdir/

I would like to have the following output:

dir1/subdir/relevant_file1.c
dir1/subdir/relevant_file2.c
dir2/subdir/relevant_file3.txt
dir2/subdir/relevant_file4.java
dir3/subdir/relevant_file5.cpp

I presume this should not be too difficult using find, but I not quite been able to figure it out. It's difficult to search for this problem because it is so specific, and just searching for "find file by matching on its path" doesn't produce anything useful.