I have first reported this issue on StackOverflow (see some description there): http://stackoverflow.com/questions/32141414/zf2-wants-truncated-controller-name-when-rendering-template-why?noredirect=1#comment52173892_32141414.

Although I declare 'MyCtrl', Zend 2 wants me to use 'my' when rendering a template.

// Mapping controller names to controller files
'controllers' => array(
'invokables' => array(
'Template\Controller\MyCtrl' => 'Template\Controller\MyController'
)
),