The Spanish word 'trajín' (meaning 'bustle' or 'coming and going') has its roots in the Latin word 'trahere', which meant 'to drag' or 'to pull'. This evolved into the Vulgar Latin 'traginare', maintaining a similar meaning of 'to drag' or 'to carry'. In Spanish, this developed into the verb 'trajinar' meaning 'to carry back and forth', and finally gave rise to the noun 'trajín' which describes the bustling activity or constant movement involved in carrying things back and forth.

A closely related and more common Spanish word is the verb 'trajinar', which means 'to carry back and forth' or 'to move things around repeatedly'. This verb is more concrete in meaning than the noun 'trajín', as it specifically refers to the physical action of moving things, while 'trajín' refers to the general busy activity or commotion that results from such movement.

While not immediately obvious, the English word 'traction' is a distant cousin of 'trajín', as it also comes from the Latin 'trahere' (to drag or pull). Another English relative is 'tract', as in 'a tract of land' or 'tractable', both relating to the idea of pulling or drawing. The word 'train' is also related, originally referring to something that was drawn or pulled along. While these English words maintained more of the original 'pulling' meaning, the Spanish 'trajín' evolved to emphasize the busy activity that results from such movement.