"Goo-goo Eyes" vs "Google Eyes"

I find references to both of these phrases! When is one used versus the other? Thank you.

I am not sure. There's the expression "goo-goo eyes" and then there's a song:

Barney Google
by Spike Jones

Barney Google, with his goog- goog- googley eyes.
Barney Google had a wife three times his size.
She sued Barney for divorce
Now he's living with his horse.
Barney Google, with his goog- goog- googley eyes.

goo-goo eyes - to cast amorous glances at. 1901.
googy eyes - same meaning as goo-goo eyes. 1919
google-eyed - 1902-03 Ade "People You Know" 106. The men were all google-eyed.

From Random House Historical Dictionary of American Slang, Volume 1, A-G by J.E. Lighter, Random House, New York, 1994.

That reference didn't have a definition for "google-eyed." But it look to me like "goo-good eyes" are about boy/girl looks and "google-eyed" is just being wide-eyed and excited about something.