Phyllis

Lissie, Lissa and Issy could be nicknames.

Based on 2023 statistics, the most common age for an American woman named Phyllis is 71 years old. It is the 283rd most common first name in the U.S. (1 in 1373 people). Only 11 girls born in 2023 were named Phyllis in the U.S. [source: Wolfram Alpha]

Although unrelated, most people have usually used Phyllis as a feminine form of a similar sounding name, Philip.

The name Phyllis was given to 22 girls born in the US in 2015.