The Spanish verb 'llorar' (to cry, weep) comes directly from the Latin verb 'plorare', which had the same meaning. The evolution from Latin 'pl-' to Spanish 'll-' is a common sound change in Spanish - you can see this pattern in other words like 'pleno' becoming 'lleno' (full). This initial 'pl-' to 'll-' shift is one of the characteristic features that marks Spanish's development from Latin.

Some related Spanish words include 'llanto' (crying, weeping) and 'llorón' (crybaby), which are both derived from the same Latin root. The word 'plañir' (to wail, lament) is also related, maintaining the original Latin 'pl-' sound due to being a more learned borrowing.

While English 'cry' is not related to 'llorar', there are some English words that share the Latin ancestor 'plorare'. These include 'deplore' (to feel or express strong disapproval), 'explore' (originally meaning to investigate by crying out), and 'implore' (to beg earnestly). All these words contain the idea of calling out or crying, though their meanings have become more specialized over time.