The Spanish word 'crepa' comes from the French word 'crêpe', which refers to a thin pancake. The French term itself can be traced back to the Latin word 'crispus', meaning 'curly' or 'wavy'. This etymology makes sense when you consider the characteristic wrinkled or wavy edges that often form when making crêpes, as well as the way the thin pancake can be rolled or folded into waves.

While 'crepa' is a relatively recent borrowing from French into Spanish, it's worth noting that Spanish doesn't have many common, simpler words that share this exact Latin root. The word 'crepa' itself is quite straightforward and commonly used in modern Spanish to refer to this popular thin pancake.

English speakers might find it helpful to know that the English word 'crisp' also comes from the same Latin root 'crispus'. While 'crisp' took on the meaning of something firm, brittle, or fresh in English, you can still see the connection to the original Latin meaning of 'wavy' or 'curly' in terms like 'crispy' when describing wavy potato chips or the wrinkled, wavy texture of certain foods. The English word 'crêpe' is borrowed directly from French, just like the Spanish 'crepa'.