Tigger · noun1
An alteration of tiger, coined by the English author Alan Alexander Milne (1882–1956) as the name of the tiger friend of Winnie-the-Pooh, who is introduced in The House at Pooh Corner (1928) and described as “a Very Bouncy Animal”.
Tigger · noun2
From the initials of The Independent Group + -er.
Etymology from Wiktionary, CC BY-SA 4.0.