Appendix:French diminutives of given names


 * Catherine → Cathy
 * Christelle → Chris
 * Christophe → Chris
 * Frédéric → Fred
 * Grégory → Greg
 * Jean-Michel → Jean-Mi
 * Philippe → Phil
 * Stéphane → Steph
 * Stéphanie → Steph

Dropping the first syllable is also attested:


 * Christophe → Tophe

Sometimes, only central syllables are kept:


 * Augustin → Gus
 * Emmanuel → Manu
 * Emmanuelle → Manu

Another method commonly used is doubling one syllable of the name:


 * André → Dédé
 * Annie → Nini
 * Augustin → Tintin
 * Christophe → Totophe
 * Joseph → Jojo
 * Julie → Juju
 * Louis → Loulou
 * all female names ending in -tine → Titine

For male names, the ending -ot is attested, although its use is rather dated:


 * Charles → Charlot
 * Jean → Jeannot
 * Jules → Julot
 * Pierre → Pierrot

It was also sometimes (but rarely) used for females:


 * Marguerite → Margot

The ending -et for males was used around the Renaissance, and is now obsolete:


 * Henri → Henriquet
 * Jacques → Jacquet

For female names, the ending -ette was used in the first half of the 20th century, and even often given as the official name:


 * Anne → Annette
 * Jeanne → Jeannette
 * Marie → Mariette
 * Paule → Paulette

Some names in -ette are not actual hypocorisms, but the only existing femalized form of a male name:


 * Antoine (male) → Antoinette (female)
 * Pierre (male) → Pierrette (female)

The ending -on is rarer, often dated or obsolete, used for both genders:


 * Antoinette → Toinon
 * Henri → Riton
 * Marie → Marion
 * Louis → Louison
 * Louise → Louison

The ending -ou is also rare:


 * Anne → Nanou

A special case is the ending in -ick/ -ic, which is a hypocoristic form typical from Brittany, used for both genders, and that became in vogue for official names in the second half of the 20th century:


 * Anne → Annick
 * Françoise → Soizic
 * Louis → Loïc
 * Yann → Yannick

The connotation of familiarity (my friend Jean-Phi, as opposed to my new work colleague Jean-Philippe;