As discussed over a chat with Sajana:-

"When we receive a new ticket, the contact would be then created automatically in the system and since last name is mandatory the values are pre-filled in the last name field of the contact. Also there may be cases where there are multiple names for the customer and we would not be able to bifurcate it therefore the system will automatically  input the name in the last name field of the system"

Can you not make it so that it puts anything up to the first space in to the forename field and then the rest in to the surname field ? - and if no space is present then just put it in the surname field ?

Otherwise it means lots of extra pointless work correcting names in the system.