Meaning A girl's name of Gaelic origin, it means "Slender Variant of Caley or Cailley: (french) 'from the Forest." Origin of Cailley Gaelic , Irish Popular Middle Names Pronunciation 🔊 Listen Cailley Similar Names Caylie Caela Caila Kylin Kyleena Trina Brianna Briana Caylee Amice Year by Year Popularity of Cailley