Today's Fry's English Delight, in which Stephen Fry "explores the highways and byways of the English language", was all about the roots of the word "hallo".
And very interesting it was, too, drawing links with "holler", "hola", "hello" and various other phrases, exclamations and utterances. Even my maiden name namesake Davy Crockett was attributed as being one of the first users of the word, what ho.
For those of you existing without the luxury of being able to listen to the radio at nine in the morning, you have a week in which you can still catch the programme on iPlayer. Simply go to http://www.bbc.co.uk/programmes/b00lv1k1