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U

Ubas

Ubas (Tagalog for "grape")

Uber

Ubi

Ubu

Udi

Udo

Uglier

Ugly

Ugly Cat Joe

Ugly Katie Mills

Ugly-Bugly

UH

Uhura (after the female character in Star Trek)

Uki

Ulee

Ulian

Ulla

Ultimate

Ultimate Kitty

Ultimate Warrior

Ultra

Ultra Sonic

Ultra Sound

Ultraviolet

Ulysses

Uma

Uma (after the actress Uma Thurman)

Umbra

Umgow (after the old Tarzan movie word which meant anything)

Umgowa

Umi

Umma (Turkish for "hope")

Umpa Lumpa

Unagi

Unbee

Unbelievable

Uncle Buster

Uncle Charles

Uncle Charles Willoughby

Uncle Charlie

Uncle Eeker

Uncle Fester

Uncle Marshmallows

Uncle Pee

Unco

Uncommon

Under My Foot

Under My Thumb

Underdog

Underfoot

Undun

Unicat

Unicorn

Unique

Unit

United Kittydom

Unity

Uno Emily

Unusual

Unusual Suspect

Unzen

Unzen (after the vulcano in Japan)

Upside Down Kitty

Upton

Uranium

Uranus

Urban

Urchin

Urgent

Uriah

Urrp (Purr inside-out, or for audiophiles, it's an out of phase purr)

Ursa

Ursa Major

Ursa Minor

Ursula

Urza

Useless

Usher

Ushki

Ushki (Russian for "ears")

Usual

Usual Suspect

Usually

Usul

Uther

Utopia

Uwe

Uzee

Uzi

Uzo