The Spanish word 'hebilla' (meaning 'buckle') comes from the Vulgar Latin word 'fibella', meaning 'small clasp', which itself was derived from the Classical Latin word 'fibula', meaning 'brooch or clasp'. The evolution from 'fibula' to 'hebilla' shows some typical sound changes from Latin to Spanish: the initial 'f-' became 'h-' (a common change in Spanish), and the diminutive suffix '-ella' evolved into '-illa'.

While 'hebilla' doesn't have many common Spanish relatives that would be simpler for students to recognize, it's worth noting that the Spanish word 'fíbula' exists as a cultismo (learned word borrowed directly from Latin) and preserves the original Latin form. However, 'fíbula' is mainly used in technical or medical contexts to refer to the smaller bone in the lower leg, just as the English cognate 'fibula'.

English speakers might recognize the connection to the word 'fibula', which comes from the same Latin root. While in English this word primarily refers to the leg bone, it's interesting to note that the bone was named after the Latin word for 'brooch' or 'clasp' because of its resemblance to a Roman clothing pin. The English word 'fiber' is also distantly related, as it comes from the Latin 'fibra', which may share an ultimate root with 'fibula' due to the connection with thread-like or fastening objects.