The boys have been on the island so long that they are forgetting what life is like back home. There are no proper rules and the boys are not looked after properly and slowly, they forget more and more things as they become more like savages. It even goes as far as Percival forgetting his name.
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The significance is that the boys are forgetting who they are, they are no longer civilised as they spend more time on the island. They forget about so many things, even to the extent where Percival does not remember his own name.
In the last chapter of Lord of the Flies, a French officer asks Percival his name, but Percival can't remember it.
Percival
Percival repeats his name all the time in Lord of the Flies because it is the only thing that he has to remind himself of who he is and from where he came. It is his only tie to humanity.
Water in Lord of the Flies symbolizes rebirth.
adaptation to the island