comes from the Middle English expression "God spede (you)" or "God speed you on your way", a wish for success and fortune for one setting out on an enterprise, voyage, adventure, or travels.
It may also mean good luck.
But.........it does. Success on your adventure and for me, not to only speed you on your way, but to speed you back home.
It feels like this word is filled with
and blessings........mostly blessings.
So, the next time you leave home, weather for one day or thirty, Godspeed my friend.