The spelling of the word "Jenilea" might seem unusual, but it can be broken down into its phonetic components. The first syllable, "Jen", is pronounced /dʒɛn/, with a soft "g" sound as in "gentle". The second syllable, "i", is pronounced /aɪ/, like the "i" in "ice". The final syllable, "lea", is pronounced /liə/, with a long "e" sound as in "leap". Therefore, "Jenilea" is pronounced as /dʒɛn.aɪ.liə/.
There doesn't seem to be any widely recognized or documented etymology for the name "Jenilea". It appears to be a relatively uncommon and possibly invented name.