Wickedpedia: Why is it called a CharlieCard?
Briefly

Contactless payment and CharlieCards will be separate forms of payment in the foreseeable future, each serving distinct riders.
The 'CharlieCard' is named after the character in 'The M.T.A. Song', a protest song about a man trapped due to fare increase in the 1940s.
Read at Boston.com
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