I recently heard someone sing this song and use the "normal" pronunciation of "Chile" (like Chilli, e.g.) as opposed to rhyming it with "a while" ..... it actually jarred, didn't scan well, and sounded quite bizarre!!!
Rounding the Horn (the gallant frigate, Amphitrite one ....)
Farewell to Valparaiso, farewell for a while, Likewise to aII the Spanish girls all on the coast of Chile; And if ever l live to be paid off l'll sit and sing this song: "God bless those pretty Spanish girls we left around Cape Horn." (version taken from the DigiTrad)