To actually be serious instead of flip, I think "Calvin" is just the name of the software, without being an acronym or initialism. However, the authors may be

To actually be serious instead of flip, I think "Calvin" is just the name of the software, without being an acronym or initialism. However, the authors may be alluding to John Calvin and perhaps some Calvinist idea such as predestination, just as the Cassandra the database is named after the greek historical or mythological figure Cassandra "someone whose accurate prophecies are not believed by those around them".