Given the details in the above questions, the only thing I found missing, is the Lucene config for master index. I am also running a platform on Sitecore 8.2.2 with Lucene and in a setup similar to yours (1 CM and 2 CDs).
My lucene index for Master DB looks like this:
Item name (_name) field in lucene/solr is defined as text type, so it is stored as a tokenized value in search indices. So when you search using name, (query will be formed like _name:(alumni)) it will return all items which contains "alumni" in name.
By default, Name/_name is a tokenized field so the result you are getting is absolutely valid/expected.