What is the Knave of name in Alice Wonderland?

The character you're likely thinking of is the Knave of Hearts, not "Knave of name". He's a major character in the trial scene in "Alice's Adventures in Wonderland" by Lewis Carroll.

The Knave of Hearts is accused of stealing the Queen of Hearts' tarts, but he maintains his innocence. He's a rather silly character, prone to making nonsensical statements and getting confused easily.

The Knave of Hearts isn't the only Knave in the book; there are also the Knave of Diamonds and the Knave of Clubs. However, the Knave of Hearts is the most prominent and well-known.