Teddy
The world called him Teddy because that was what his parents would have called him.
He was Uncle Harry's Teddy when he sat on his shoulders and cheered loudly for Aunt Ginny, legs and arms flailing, while she played her first game for the Harpies.
He was Molly's Teddy-Bear when she let him taste the sauce she was cooking, oder lick off the dough that still stuck to a spoon.
He was Freddie's first word, a mumbling, gurgling Teddy, and he was Lucy's first word, even if Percy swore, she'd tried to say "Daddy".
He was Teddy when he introduced himself shyly to the kids in the compartment of the Hogwarts Express he'd stumbled into.
He was Teddy for great aunt Narcissa and her Draco, whom she didn't bring often when she visited Grandma, and later for little Scorpius, who was fascinated by his cousin's changing hair colours.
He was Teddy whenever he signed a letter home and Teddy when Hagrid invited him for tea.
It was the name his parents whispered when he dreamed of them.