Olly
[ˈɑːli]Meaning
a diminutive of Oliver
Background Story
Olly is a diminutive of Oliver. Behind the Name records it as used in Catalan, Croatian, Czech, Danish, Dutch, Estonian, Finnish, French, German, Hungarian and Icelandic, and Wikipedia describes it as a variant of the given names Olivia and Oliver.
Variations
Ollie

Related Names
Ossi
A diminutive of Osmo, Oskari and other names beginning with Os
Wisk
Recorded as a masculine given name in Kashubian
Accie
Bitty
Recorded as a feminine given name in English
Boba
Recorded as a given name in Popular Culture (masculine) and Pashto (feminine)
Boxi
A Chinese surname (薄奚), also a disambiguation page
Bubs
Bumby
Chibby
Cori
Feminine form of Corey