According to the Wikipedia page located in the related links section below. There are currently 31 colours which have been given a name that starts with "A":
- Air Force Blue
- Alice Bluie
- Alizarin
- Almond
- Amaranth
- Amber
- Amber (SAE/ECE)
- American Rose
- Amethyst
- Anti-flash White
- Antque Brass
- Antique Fuchsia
- Antique White
- Ao
- Ao (English)
- Apple Green
- Apricot
- Aqua
- Aquamarine
- Army Green
- Arsenic
- Arylide Yellow
- Ash Grey
- Asparagus
- Atomic Tangerine
- Auburn
- Auroline
- AuroMetalSaurus
- Awesome
- Azure
- Azure Mist
apple green
ANSWER There are a couple; ALICEBLUE, AQUAMARINE, ANTIQUEWHITE, AQUA¹,and AZURE.
ANSWER
aubergine (deep purple)
auburn
alabaster
amber
Amazon Green
Apricot is all i can think of.
apricot
Amber
Aqua
Azure
Azure, aquamarine
Alizarin, Amaranth, Amber, Amethyst, Apricot, Aqua, Arsenic, Asparagus, Atomic Tangerine, Auburn, Azure, Almond. There are variations of many of the colours listed.