Jainism describes various types of celestial beings (devas), including the Vaimanik devas, who reside in the heavenly abodes (Vaimanika lokas). Among the Vaimanik devas, there are many classes and individual names mentioned in Jain texts.

A well-known Vaimanik dev whose name starts with the letter "A" is:

Asurakumar (असुरकुमार)

Asurakumar are a specific class of Vaimanik devas mentioned in Jain scriptures. They are considered one of the eight classes of Vaimanik devas. Their chief is sometimes referred to as "Asurakumar Indra".

If you are seeking the name of an individual Indra (king) of the Vaimanik devas starting with "A," one example is:

Aparajita (अपराजित)

Aparajita is the name of an Indra (king) of one of the Vaimanik heavens described in Jain texts.

References:

• "Jainism: The World of Conquerors" by Natubhai Shah
• "Jain Cosmology" by Vijay K. Jain

If you need more specific names or details, please clarify which class or level of Vaimanik dev you are referring to.