The story
- Proto-Brythonic · derived from*penn“head; top, height”
- English todayInkpen
From an unrecorded Old English element *ing (“hill, peak”), which has been postulated to explain a number of placenames such as Ingon or Ingham, + penn (“enclosure; fold”). The second element may alternatively be Proto-Brythonic *penn (“head; top, height”), but that's less likely.
Words from the same roots
Proto-Brythonic*penn all →
Etymology from Wiktionary, CC BY-SA 4.0.