The Spanish verb 'seguir' (meaning 'to follow') comes from Vulgar Latin 'sequire', which developed from Classical Latin 'sequi', also meaning 'to follow'. The evolution from Latin to Spanish shows a typical sound change where 'qu' became 'gu' in Spanish, making the word easier to pronounce while maintaining its original meaning.

Several common Spanish words are related to 'seguir', including: 'siguiente' (next, following), 'segundo' (second), and 'séquito' (entourage, following). All these words share the basic concept of following or coming after something else. The word 'perseguir' (to pursue or chase) is also related, combining the prefix 'per-' (through) with 'seguir'.

English has several words that share the same Latin root as 'seguir', including 'sequence' (a following of one thing after another), 'subsequent' (following after), 'consecutive' (following continuously), and 'pursue' (to follow in order to catch). The word 'second' is also related, as it originally meant 'following' (as in following the first). Even 'suite' (as in a suite of rooms) comes from this root, referring to things that follow one another.