Most people only say Madonna because they are both white, blonde, Italian females.

You know what? I'm going to change my answer yet again. Instead of choosing between Marilyn and Angelina, I will go with both. Marilyn and Angelina are Gaga's main inspirations.

Funny enough those are Madonna's biggest inspirations as well. Madonna's been copying Marilyn throughout her entire career and she suddenly started adopting kids (which gave Madge an enormous well-needed relevancy boost) once Angie set the adoption trend.

David Bowie and Madonna the most.
Some others Lady Starlight, Britney, etc

More than the people being listed.

Angie set the Home wreck trend

Queen Madge of course.

The terminology of most ain't in the aspects of Stefani's inspirational palette. Legends (Madonna, Cher, Christina Aguilera, Bruce Springsteen, etc, etc, etc), and icons (Grace Jones, Bjork, Cyndi Lauper, etc, etc, etc) have inspired all of Stefani's career as Gaga, without them Gaga wouldn't even be born.

death @ britney being an option

David Bowie or Queen. Madonna too

Bowie.

More.than 1 person.

The correct answer is "More Than One Person" because Madonna, Bowie, Elton, Whitney, Britney, Beyoncé, Grace Jones, and Alice Cooper have all influenced her.