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You wish to maintain the brevity of the names, so I would suggest inserting silent consonants at the end of some, changing Ara to Aragh or Arah to differentiate it visually from the other names. ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/44611 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
You wish to maintain the brevity of the names, so I would suggest inserting silent consonants at the end of some, changing Ara to Aragh or Arah to differentiate it visually from the other names. You could consider adding a z in the first syllable. Ara could become Azragh, Arzah or Arzagh. Minor changes to names can be enough to help make them easier for the reader to recognize as unique to the character. Some of your names do sound similar, but they obey the constraints you imposed. Using consonants that are pronounced as vowels in other languages might help with the variety unless the constraint requires a true vowel to be the initial letter. If it is the vowel sound that is what matters, in some languages H is not pronounced though it is present, with hotel being pronounced otel. You might want to consider adding an apostrophe to a name, such as Eril and it could become Er’il. Changing the appearance of the name can be enough to make the reader see them as very different names.