MeganMargotEliseSadieAdelineAnitaAnnikaCarlottaNatashaJeanette and other ette names like
AnnetteJanet (basically any elaborated nickname that is longer than the name itself)
GretchenCarrieNadia /
NadyaKate
BillyHankLiamFeivelLarryNickTonySamTerry (also for girls)
Frank
But then again, it’s OK in the current English culture to have business people, MPs etc called just
Tony or just
Nick. No one really cares. Most people don’t even realize
Jack is a nickname for
John or that
Janet was originally an affectionate nickname for
Jane.