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Latin penna
← Proto-Indo-European *peth₂- (root)
← Proto-Indo-European *péth₂r̥ (derived)
← Proto-Indo-European *peth₂- (mention)
← Proto-Italic *petnā (derived)
← Latin pinna (mention)

→ English pen (derived)
→ English pin (cognate)
→ English feather (cognate)
→ English pennant (derived)
→ English penna (derived)
→ English pennaceous (derived)
→ English impennous (mention)
→ English pinion (derived)
→ English penniform (derived)
→ English brevipen (mention)
→ English pennipotent (mention)
→ English pennigerous (mention)
→ English pennage (derived)
→ English pennal (derived)
→ English pennibrachium (derived)
→ English penniferous (derived)
→ Old English feþer (cognate)
→ Catalan penell (mention)
→ Welsh pìn (derived)
→ Welsh adar (cognate)
→ Danish pen (derived)
→ German Pennal (mention)
→ Middle English penne (derived)
→ Spanish peña (inherited)
→ Spanish pendón (derived)
→ Faroese pennur (derived)
→ French penne (mention)
→ French panne (mention)
→ Old French empaner (derived)
→ Friulian pene (inherited)
→ West Frisian fear (cognate)
→ Irish peann (borrowed)
→ Scottish Gaelic peann (derived)
→ Galician peneira (derived)
→ Manx penn (derived)
→ Hungarian penna (derived)
→ Indonesian pen (derived)
→ Indonesian pena (derived)
→ Icelandic penni (derived)
→ Italian penna (inherited)
→ Italian penero (mention)
→ Italian pimpinella (mention)
→ Latin accipiter (mention)
→ Latin passer (mention)
→ Latin pinna (mention)
→ Latin bipennis (affix)
→ Latin pennatus (suffix)
→ Latin longipennis (compound)
→ Latin maculipennis (compound)
→ Latin fuscipennis (compound)
→ Latin brevipennis (compound)
→ Latin latipennis (affix)
→ Latin nigripennis (compound)
→ Latin flavipennis (compound)
→ Latin punctipennis (compound)
→ Latin angustipennis (compound)