The name Jenna is a girl's name of English, Welsh origin meaning "white shadow, white wave". Jenna is ranked #386 on our popularity charts and is often added to lists like Names That Mean Water and discussed in our forums with posts like "drop your least favourite w randomly generated names - girls with middles".
From the experts:
Jenna was first noted on the 1980s TV series Dallas, later associated with one of the First Twin Daughters. Jenna is still being used, but no longer feels much fresher than Jennifer. You can also spell it Jena, but then many people will pronounce it jeen-a, as in Gina.