On the other hand, I know Allisons and Alexandras who go by Al, and for them it's youthful & cool.
With the exception of Alexander, the usual full names for Al are pretty past their prime--although Alfie is making a surprising comeback, and Ali is pretty chic for a boy, too.
- Alaric (AL-ah-rik, Germanic)
- Alastair (AL-as-tair, Scottish)--form of Alexander. Also spelled Alistair or Alasdair.
- Alban (AL-ban or AHL-ban, German, French)--from Latin Albanus.
- Alby (AL-bee, Irish)--Anglicized from Ailbhe.
- Alden (AHL-den, English)
- Aldric (AHL-drik, Germanic)
- Álmos (AHL-moshe, Hungarian)
- Aloysius (al-oh-ISH-us, English)--A form of Louis.
- Alphaeus (al-FEE-us, Latin)--from Hebrew, "changing"
- Altair (AHL-tair, English)--from Arabic, "flyer"
- Alaia (ah-lye-ah, Basque)--"joyful"
- Alastríona (al-as-TREE-nah, Irish)--form of Alexandra
- Alazne (ah-lahs-nee, Basque)--"miracle"
- Aldith (AHL-dith, English)
- Aldona (ahl-DAW-nah, Polish)
- Aleida (AHL-eye-dah, Dutch)--form of Alice/Adelaide
- Alethea (al-ah-THEE-ah, English)--from Latin, "truth"
- Aliyah (ah-lee-ah, Arabic & Hebrew)
- Allegra (ah-LEG-rah, English)--from Italian, "cheerful"
- Alodia (ah-LOH-dee-ah, Germanic)--original form of Elodie/Elodia
- Aludra (ah-LOO-drah, English)--from Arabic, "maiden"