Looking at various providers, they all seem to start with the "group(?)" name, followed by the kind of IO.

From the context instructions:

Context pi4j = Pi4J.newContextBuilder()
   .add(new MockPlatform())
   .add(MockAnalogInputProvider.newInstance(),
      MockAnalogOutputProvider.newInstance(),
      MockSpiProvider.newInstance(),
      MockPwmProvider.newInstance(),
      MockSerialProvider.newInstance(),
      MockI2CProvider.newInstance(),
      MockDigitalInputProvider.newInstance(),
      MockDigitalOutputProvider.newInstance())

All other providers seem to follow this XyzProvider.newInstance() pattern.

In contrast, the FFM providers seems to be following a different naming pattern (SpiFFMProviderIntsance). The "Provider" interfaces (providing the newInstance) seem to be absent.

Wouldn't it make sense to be consistent here?

Probably also with pre-existing naming conventions (SPI -> Spi, PWM -> Pwm, ... => FFM -> Ffm)