The sentence is : まあ 何人来ようが || どうってこともないがな... (|| = Column break.) It doesn't matter how many people want to come... I'm not sure whether the first が is the subject particle (and ...
Consider these: ～か： 静か 愚か 厳か ～やか: 穏やか 鮮やか 賑やか ～らか: 柔らか 滑らか 明らか There are many more that I've not listed. The か/やか/らか at the end of these words ...