I kind of like it. Somehow it simultaneously seems trendy and a little dated (not as much as
Megan, and I don't really associate these two names with each other because they don't rhyme for me.) I pronounce
Tegan as TEE-gan (long E sound) and
Megan as MEG-an (short E sound).
Side note - I always though
Teagan was just a different spelling of
Tegan or vice versa - didn't realize they came from completely different roots. I pronounce them the same so maybe that's why.
and this is but an island in an ocean