McCool. I αccullαy know someone who name is Samantha McCool(;
We're never told. Endora tells Darrin that he'd never be able to pronounce her last name and I think that is the most we know about any of the witches' last names, with the exception of Samantha, of course
A good starting point is William Wordsworth.
Adams, Atchinson.
Asimov
Here's a good link listing the top 1,000 American last names!
karimzadeh
Trujillo
AaronsonAbbotAbbernathyAcherAckerAbramsAsheAdrianAlexanderAmsterdamAtwoodAsminovAspenAltshelerAmbersonAnastasiAltenbachAlbertsonAlbertAbrahamAikenAsuntiAldeenAsterlyAstridAlcottArlingtonAnthropAdamsAddisonAguliarAhernAimsworthAimesAltenbachAlbrechtAllertonAllanAlphonseAnistonAndersonAndrewsAntonAndreAustenAppletonAschAxelrodArsenostAshleyArandaAllmanAnsonAritelliAchresbyArcherArmetronArchambeau
List all Mexican last names that start with P
xavi,xaxaxaxxa
someone long ago said, I want my last name to be...
Mendoza, Medrano,