Family name origins & meanings
- Polish : nickname from flak ‘bowel’, ‘gut’, also ‘rag’.
- German and Danish : according to Søndergaard, a topographic or field name, from Low German flak ‘swampy grassland’, ‘shallow water’.
- German : topographic name for someone who lived in flat terrain, from Middle High German vlak ‘flat’, or, according to Bahlow, a variant of Flake.