Surname Холбрук (Holbrook 
, Holbrooke 
, Холбрук 
) , all around the world, is a common family name. The last name Холбрук is habitual in the United States, where it is quite a rare surname, the United Kingdom, and New Zealand. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Canada.
| VARIANT | COUNTRY |
|---|---|
| Holbrook | United Kingdom, Kenya, Australia, United States, Canada |
| Holbrooke | United Kingdom, Australia, United States, Canada, Brazil |
| Холбрук | Kazakhstan, Ukraine |