Would the English name "Cody" (pronounced normally, k OH - d ee) be translated into katakana as コーディ or コーディー?
I understand the dash is used to elongate vowels so I'm not sure if the "ee" sound would require it or not.
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Both transliterations are fine and natural. You can choose whichever you like unless you are a professional writer and have to follow some opinionated guideline. But I feel I see the elongated version more often in daily life.
When you transliterate Western foreign names, short names usually have a trailing
ー (e.g., ジョー, ハリー, コナー). If the name is three morae long or more without the trailing
ー, then the trailing
ー is often optional (e.g., ケネディ/ケネディー).