Клички кошек и котов

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