A modern invented name, likely combining Jay and Lynn.
Jaydynn is a contemporary American invention. It most likely functions as a creative elaboration of the name Jayden, or a portmanteau of the bird-inspired name Jay and the Welsh-rooted Lynn, meaning lake. Its usage is part of a broader trend of adding 'y' and double consonants to create unique phonetic spellings.
Less common today
Jaydynn isn't in the latest US Top 1000. It last peaked at #10,861 in 2007.
US births per 5-year period, 1990βpresent (SSA data).