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Y

Yabba-Dabba-Doo

Yabby (after the South Eastern Australia small freshwater crayfish)

Yacatecuhtli (Aztec mythology the god of merchant adventurers)

Yacov (Hebrew form of the name Jacob, meaning deceiver)

Yago

Yahoo

Yak

Yaki Mondu

Yala

Yam

Yamasee

Yancy

Yanet

Yang

Yankee

Yar

Yardley

Yasha

Yashi (short for Kobiyashi Maru, Starfleet academy test that Kirk beat)

Yashie

Yasmine

Yawgmoth

Yawhmoth

Yawney

Yaxche (Maya mythology the tree of heaven under which good souls rejoice)

Yaya

Yeager

Yedi

Yeep

Yeller Yang

Yellow

Yellow Cat

Yellow Man

Yellow Mellow

Yellppy

Yeltsin

Yemma

Yemma-Lee

Yenta

Yenta Banana

Yentyl

Yeow

Yes

Yessir

Yessirree

Yeti

Yicks

Yicky Sticky Chicky

Yin

Yin Mae (beautiful female)

Yin-Yang

Ying

Yip

Yipes Stripes

Yippee

Yitzak

Ymie

Ymilie

Yo Yo

Yo-Yo

Yoda

Yodel

Yodelaheehoo

Yodeller

Yodi

Yodler

Yogi

Yogi Bear

Yogso'Thoth

Yogurt

Yokia

Yoko

Yoko Fudgeface

Yoko Oh No!

Yoko Ono

Yolanda

Yommie T. Bear

Yonori

Yoomper

Yoppie

Yorcat

Yorgy

York

Yosemite

Yosemite Sam

Yoshi

Yosie

You

You Go

You Rotten Feline!

You Too

Young Fella

Young Yeller

Your Cat

Your Highness

Your Hugeness

Your Immensity

Yours

Yours, Mine and Ours

Youser

Yow-sers

Yowler

Yoyo

Ysidro

Yue

Yugo

Yuki

Yukon

Yukon Cronilius

Yul

Yule

Yum Kaax (Maya mythology the maize god)

Yuma

Yumi

Yumiee

Yummy

Yumyum

Yuppie Cat

Yuppy

Yuri (Japanese for Lily)

Yushamishi