86%RatingSave Gender Masculine Usage English (Modern) Pronounced Pron. THACH-ər [key·IPA] Meaning & History From an English surname that referred to a person who thatched roofs by attaching straw to them, derived from Old English þæc "thatch". The surname was borne by British prime minister Margaret Thatcher (1925-2013). DetailsPopularity Last ranked #798 in 2019 United States Categories surnames Entry updated May 29, 2020 ·