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I suppose it's okay, though it does look rather dated. While I think Genna looks nicer than Jenna, the spelling might be confusing for some people, and they might pronounce it as "GEHN-ə", so I'd pick Jenna from the two of them.
Some combos:
Jenna / Genna Bernadette
Jenna / Genna Evangeline
Jenna / Genna Magdalene
Jenna / Genna Penelope
Jenna / Genna Rhiannon