The name digamma was used in ancient Greek and is the most common name for the letter in its alphabetic function today. It literally means "double gamma" and is descriptive of the original letter's shape.

How was digamma pronounced?

The sixth letter of the early Greek alphabet (Ϝ, ϝ), pronounced as “w.” It became obsolete in many Greek dialects before the Classical period. ... 'If anyone knows how to put a digamma in, let me know, and I'll fix it. '

When was digamma used?

2 Background: A Brief History of the Letter Digamma

In the mid eighth century BC, when alphabetic Greek is first attested, almost all of the Greek dialects with the exception of Attic-Ionic still retained the /w/ sound.