Well, most of the people on this site are against ANY adjustments and/or creative spellings, really. This is an etymological site, after all. Meaning words are spelled a certain way for one or several good reasons.
I
LOVE the name Teadghan (spelled this way).
Teagan is more of an anglicised form of the original Welsh version, but still a more common one. And Teadghan is pronounced TIE-gan as in
Tiger, more or less...
Hope this helps
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Common sense happens to be the least common of all senses