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Consider the following Ancient Greek word:
κήπος
This means "garden". 'horto' is the Latin. 'jardin' in French is obviously the root for garden, but the links between Latin, Greek and English here are unclear. All the English/French roots appear to lead to "gardo" or something with a "g".
What is the etymology of the word "kipos"? Where does it come from? Why is Latin so distinct, and similarly the Old French so different to Latin or Greek?
(Side note: the ancient form is κῆπος, with a circumflex.)
The standard way to approach this sort of question is to look up the words in a good etymological dictionary. If you don't have one on hand, and don't want to make a trip to the library, Wiktionary will do in a pinch; I advise against Etymonline, which is popular but presents Proto-Indo-European etymons in a misleading way.
For these particular words, it's been suggested that kêpos is cognate with Germanic *hōbō > Dutch hueve "farmstead", from something like *keh₂péh₂. Hortus is cognate with Irish gort "field", Ancient Greek khórtos "pasture", Old English ġeard > English "yard", from something like *ǵʰórtos or *gʰórdʰos. A Germanic cognate of ġeard was borrowed into Mediaeval Latin, becoming gardīnus "garden", which became French jardin (and English "garden" through a Norman loan).
ē(or ambiguously ase), noti, which is only proper to Modern (or Byzantine) Greek