The Spanish word 'justa' (feminine form of 'justo', meaning 'just' or 'righteous') comes from the Latin word 'iustus', which had the same meaning. The Latin 'iustus' was formed by combining the root 'ius' (meaning 'law, right, justice') with the past participle suffix '-tus'. Over time, as Latin evolved into Spanish, the initial 'i' sound shifted to 'j' and the word took on its modern Spanish form.

Some common related Spanish words include 'justicia' (justice), 'justificar' (to justify), and 'ajustar' (to adjust or make right). All these words share the same Latin root 'ius' relating to law and justice, making it easier to remember their meanings as they all connect to concepts of righteousness, fairness, or making things correct.

English speakers can easily connect 'justa' to several familiar English words that come from the same Latin root, such as 'just', 'justice', 'justify', and 'adjust'. The connection is clear both in form and meaning - these words all relate to concepts of fairness, righteousness, or making things right. The English words maintained more of the original Latin spelling with 'ju-' rather than the Spanish 'ju-/jo-' pronunciation.