Garret
Garret meaning: To watch.
Garret origin: English
Garret gender: Male

Garreth
Garreth meaning: Gentle, modest, brave. Sir Gareth was a legendary knight of King Arthur's Round Table.
Garreth origin: Arthurian Legend
Garreth gender: Male

Garrett
Garrett meaning: Powerful with the spear.
Garrett origin: English
Garrett gender: Male