AA ———
Aachen Aanonsen Aardapple Aasen

AB ———
Abate Abath Abbat Abbe Abbott Abderhalden Abel Abendroth Abercrombie Abernethy Abney Abraham Abrams Abravanel Abrikossof

AC ———
Achard Achenbach Acker Ackarman Ackerman Ackley Ackroyd Acres

AD ———
Adair Adam Adami Adams Adamson Addams Addington Addy Aden Adhikari Adie Adkins Adkison Adler Adrain Adrian

AE ———
Aeby Aelst Aepinus Aertsen

AF ———
Afzelius

AG ———
Agan Agassi Agassiz Agee Agena Aggeman Aggers Agnesi Agnew Agnon

AH ———
Ahern Ahl Ahlfeld Ahlfors Ahlqvist

AK ———
Akagi Aker Akerlof Akers

AL ———
Albers Albright Aldam Alder Alderman Alderson Alefounder Alexander Allden Allen(/Allan) Allgeyer Allison Allred Almquist Alpen Alpers Alphin Alspach Alston Altman Altpeter Alyea

AM ———
Amann Amaya Ambrose Ambs Ames Ammons Amon Amos Amsbaugh Amsden

AN ———
Andersen Anderson Anderton Andre Andrews Andrist Anglin Annenberg Antle Anyan

AP ———
Appel Apple Applebaum Appleby Appling

AR ———
Arabus Arbogast Arbuckle Arbuthnott(/Arbuthnot) Archibald Arciniega Ardry Arkright Armistead Armstrong Arnold Arnot Arthur

AS ———
Asbury Asche Ashby Ashforth Asquith Astaire Astor

AT ———
Ataturk Atherton Atkinson Attaway Attucks Atwater Atwood

AU ———
Auerbach Auger Augst Auld Ault Aultman Ausmus Austin Austring Autry(/Autrey)

AV ———
Avers Avery Avila

AX ———
Axford Axhausen Axtell

AY ———
Aycock Ayers(/Ayres) Aylesworth Ayotte