The name Fenna is a girl's name of Dutch origin meaning "peace". Fenna and is often added to user-created lists like Malus - Post Apocalyptic Dystopia Character Names and discussed in our forums with posts like "Baby a Day".
From the experts:
The vintage Fenna, an Old Lady name making a comeback in The Netherlands, originates in Friesland in the northern part of the country, where the Fries language is spoken. Rhyming with Jenna, it's both exotic and familiar and could conceivably enjoy wider usage. Fenna is a Top 20 girls' name in The Netherlands.