The word jambo is commonly used in Swahili-speaking nations to greet foreigners. It's a corruption of a common Swahili greeting that starts with "hujambo?", meaning "are you sick?". This is answered by "sijambo," meaning "I am not sick."
Jumbo
An African elephant imported into the West during the 19th century was named "Jumbo," a corruption of "jambo." This became a word used for large objects.