The Spanish for “chest”, pecho, sounds completely different than the English chest.
But it is related to the English word for the chest bones: the Pectoral Girdle.
The relationship is the Latin ‑ct- words transforming into ‑ch- as Latin turned into Spanish. Thus, the pect- maps to pech- exactly. The English word, on the other hand, is taken — unchanged — directly from the Latin.
Also from the same root, in Spanish, es pechuga — the common word for the common food, “chicken breast”!
The same pattern we see in noche/nocturnal, leche/lactose, etc.