But the name is not that important, is it? I mean, at the end we use an email client, no-matter-whatever-the-name

Brands are important for the companies not for the people.

It's named after Geary St. in San Francisco. Yorba's products are named after prominent streets in SF (Shotwell, Valencia, Fillmore, Lombard).

Yeah, what kind of a tree is a Geary anyway?