Used to play this with my kids when we went to my mums.
It is a 300 mile journey and really helped to pass the time.
They still play it now even though the youngest is 15.
Basically you start with a name and the next person has to pick a name that starts with the last letter of the name befoe.
For instance
if you started with Shelly
the last letter is Y so could have Yvonne
next person gets the E so could be Ewan etc etc