The Spanish word 'ajillo' comes from combining the Spanish word 'ajo' (meaning 'garlic') with the diminutive suffix '-illo'. The word 'ajo' itself derives from the Latin word 'alium', meaning 'garlic'. The diminutive suffix '-illo' adds the meaning of 'small' or can indicate an affectionate or familiar tone. Together, 'ajillo' literally means 'small garlic' but is commonly used to refer to a garlic sauce or garlic-based preparation, particularly in the famous Spanish dish 'gambas al ajillo' (garlic shrimp).

The most obvious related Spanish word is 'ajo' (garlic), which is the base word from which 'ajillo' is formed. While 'ajo' refers to the garlic itself, 'ajillo' specifically refers to a preparation or sauce made with garlic. You'll often see this word in Spanish cuisine, particularly in dish names that include 'al ajillo' (meaning 'garlic style').

While English 'garlic' is not etymologically related to Spanish 'ajillo', there are some English words derived from the same Latin root 'alium'. The most notable is 'allium', which is used in botanical and scientific contexts to refer to the genus of plants that includes garlic, onions, and related species. You might see this word in cooking magazines or gardening guides referring to 'allium vegetables' or 'allium family'.