The Spanish word 'huevo' (meaning 'egg') comes directly from the Latin word 'ovum', which also meant 'egg'. During the evolution from Latin to Spanish, the initial 'o' developed into 'hue', a common sound change in Spanish, while the final '-um' simplified to '-o', which is the typical masculine ending in Spanish.

Several Spanish words are derived from the same Latin root 'ovum', including 'oval' (oval-shaped) and 'óvulo' (ovule). These words maintain a connection to the original egg-like shape or reproductive meaning of the Latin word.

Many English words share the same Latin ancestor 'ovum', including 'oval', 'ovary', 'ovulate', and 'oviduct'. All these words relate either to eggs or egg-shaped things. The scientific term 'ovum' itself is still used in English to refer specifically to an egg cell. This common Latin origin explains why Spanish 'huevo' and these English words share similar meanings related to eggs, despite looking quite different.