Michael Clifford, one of the members, came up with it while in a science class. There isn't a specific reason why, but they had a list of band names. They chose 5 Seconds of Summer. :) In a YouTube video, called "5 seconds of summer info !" it shows him and his band member, Luke, trying to figure out a name.
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Ashton Irwin
pop rock
They dont really have a name to call their fans. Something that the fans have named themselves and what they (5 seconds of summer) just went along with was "5sos fam".
Luke Micheal Ashton and Calum
they are a type of pop and rock type of band