Basically because of what kids used to call him when he was going to school
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Piggy and Jack are complete opposites so they were bound to but heads. In the beginning Jack and Piggy didn't have a problem with each other but as the story progressed the more Jack hated Piggy. It never really stated why they don't get along but I think that it's because Jack has a different personality. Jack is power thrived while Piggy is more intellectual. Hope that helped!
The only jobs which are specified in chapter one are... Piggy is told to "take names. That's your job." Jack decides that his choir will be hunters and Ralph appoints Jack and Simon to accompany him on an expedition to discover whether they are on an island or not.
At the start of the book Piggy asked Ralph what his name was so it was obvious they didn't know each other. Once Ralph had blown the conch and boys had started to arrive at the platform Piggy asked them for their names, evidence that they were strangers to him. When the choir, led by Jack, arrived Piggy made introductions, which indicated that the boys in the choir didn't know any of the other boys. At the end of the meeting when Ralph, Simon and Jack were heading off to climb the mountain Ralph told Piggy that his job was to collect names. If he'd known the other boys he'd have already known their names.
Ralph said that near the end of chapter 2: Fire on the mounatin when Piggy admitted that he didn't know the names of the littluns.
Initially Ralph viewed Piggy as an uninvited and unwanted intrusion on his pleasure at finding himself on a tropical island. Ralph walked off when Piggy was forced to asnwer a call of nature, he didn't wait for the fat boy. Ralph didn't ask Piggy what his name was, probably because he wasn't in the slightest bit interested. Ralph probably felt that he had nothing in common with a fat asthmatic boy who wore a greasy wind-breaker, dropped letters from his words and who didn't know how to swim. Gradually however Ralph's attitude to Piggy began to change. When Ralph found the conch in the lagoon it was Piggy who identified it and told him that it could be blown. Piggy also suggested calling the rest of the boys on the island. Over the course of the book Piggy was constantly on hand to remind Ralph, when he lost track of what he was saying probably due to Petit Mal epilsepsy. Piggy was the voice of reason who suggested lighting a signal fire on the beach when it seemed that the beast was preventing the boys from relighting the fire on the mountain. Slowly Ralph's attitude changed from indifference, through a period where he simply made use of Piggy's abilities, to companionship and finally to the realisation that Piggy had been his friend.