Occasionally in her travels through her children's minds Mrs. Darling found things she could not understand, and of these quite the most perplexing was the word Peter. She knew of no Peter, and yet he was here and there in John and Michael's minds, while Wendy's began to be scrawled all over with him. The name stood out in bolder letters than any of the other words, and as Mrs. Darling gazed she felt that it had an oddly cocky appearance.
"Yes, he is rather cocky," Wendy admitted with regret. Her mother had been questioning her.

Ch. 1 - Peter & Wendy (1911)