Grundy
A surname probably from an old Germanic personal name, with some evidence also linking it to the old nickname-name Gundred/Gundry.
The #8,724 most common surname in the United States (2010 Census) — about 1 in every 82,135 Americans shares it.
Etymology
The strongest historical explanation is that Grundy comes from an old Teutonic or Germanic personal name, Grund, meaning something like "ground" or "base." One 19th-century source also connects it with the personal-name family Gundred/Gundry, treating Grundy as a later spelling shift from that older form. Because the evidence in the older dictionaries is not fully consistent, the surname is best treated as probably deriving from a personal name rather than from a common noun.
History
Older surname dictionaries place Grundy among names with West Country spelling changes and note historical forms such as Gundry, Grundey, and Grundig. The surname is also familiar from the stock phrase "Mrs. Grundy," which helped keep the name widely recognized in English literary culture. In England it appears to have been established by the medieval or early post-medieval period, with later regional spelling variation.
Origin
Regions
Variant spellings
Fun fact
The famous phrase "Mrs. Grundy" comes from an 18th-century stage character and has made the surname much better known than the family name itself.
From the historical record
“GRUND. See Grundy. GRUNDY. Apparently the old Teutonic personal name Grund, whence Grundis- borough, a parish in Suffolk. GRYLLS. An old Cornish fimily. The manor ofGrylls (comnionly mispronounced Garles), from which they proliably derive their name, is in the parish of Lesnewth in that county. GUBBDTS. GUBBES^GS.…”
— Patronymica Britannica: a dictionary of the family names of the United Kingdom