The Spanish word 'frontero' (meaning 'frontal' or 'relating to the front') comes from combining the Spanish word 'fronte' (meaning 'front') with the suffix '-ero', which is commonly used to form nouns and adjectives in Spanish. The word 'fronte' itself can be traced back to the Latin word 'frons', which meant 'forehead'. Over time, the meaning broadened from specifically referring to the forehead to referring to the front of anything in general.

Some simpler related Spanish words include 'frente' (meaning 'forehead' or 'front'), 'frontal' (meaning 'frontal'), and 'frontera' (meaning 'border/frontier'). All these words share the same Latin root 'frons' and maintain connections to the concept of being at the front or forward part of something.

English speakers might recognize the connection to words like 'front', 'frontal', 'frontier', and 'confront'. These words all ultimately derive from the same Latin root 'frons'. The concept of 'front' or 'being in front' has remained remarkably consistent across both languages, making it easier to remember the Spanish word 'frontero'.