What's in a name

Sierra:  My name is
Sisi,
Sira,
Sierra,
or
Sara.

Evelyn:  My name is
Eevlyn,
Aivlyn
Evelyn
Ev,
or....

...Casey!

???

Famous babysitters

We are at lunch discussing the song "call me maybe" and Jonathan asks who is the artist who sings it. Evelyn says, "Louise?" :-)