gistfile1.txt

$account = new \F3\FLOW3\Security\Account();
		$account->setAccountIdentifier($accountJson->username);

		$person = new Person();
		$firstnameAndLastname = explode(' ', $accountJson->name, 2);

		$firstName = '';
		$lastName = '';

		if (isset($firstnameAndLastname[0])) {
			$firstName = $firstnameAndLastname[0];
		}

		if (isset($firstnameAndLastname[1])) {
			$lastName = $firstnameAndLastname[1];
		}

		$person->setName(new PersonName('', $firstName, $lastName));

		$electronicAddress = new ElectronicAddress();
		$electronicAddress->setIdentifier($accountJson->email);
		$electronicAddress->setType(ElectronicAddress::TYPE_EMAIL);
		$electronicAddress->setUsage(ElectronicAddress::USAGE_WORK);

		$person->setPrimaryElectronicAddress($electronicAddress);

		$account->setParty($person);

		$this->accountRepository->add($account);

I added editing of a name to the blog with this commit:
http://git.typo3.org/FLOW3/Packages/Blog.git?a=commitdiff;h=6719d882f9186830adbe5c3f92795ecb4a41d15f