- What is the meaning of this name?
- What was the history behind it?
- Which country does it originated firstly?
- What ethnicity people will have this name?
I would say this is being downvoted because of your lack of own research. For example I got with the second search result on google for the search words "Lambert lastname":
Definition: Bright land or light of the land, the Lambert surname derives from the Germanic elements "land" meaning land and "beraht" meaning bright.
Surname Origin: English, French
Alternate Surname Spellings: LAMBERTH, LAMBETH, LAMBUTH, LAMBER, LAMBERTE, LAMBURT, LAMBRETH, LUMBERT
For "Lambert surname" I got:
The roots of the Lambert family are found in the ancient German state of Bavaria. [...] Lambert derives from the Old Germanic name Landbehrt, which means shining land or holy land.[...]
For "Lambert family name" I got:
Recorded in over forty spelling forms from Lambert, Lambard and Limprecht, to Lambrich, Lambertini and Lemmens, this surname is almost certainly of very early German origins. As a surname it started life in the 12th century, but the derivation is from a pre 5th century personal name. This was 'Landbehrt', composed of the elements "land", meaning territory, and "berht", bright[...]
from Last name: Lambert
So, from this two minute research alone can be deduced: 1) The words composing the name make up the meaning "bright land" or "shining land", maybe in a meaning of "holy land". 2+3) It is originating from Germany, probably Bavaria or Franconia. There also was a Bishop named "Lambertus" in the 8th century. There is a number of famous people that wore that lastname on wikipedia. 4) Families with the lastname Lambert probably originate from Central Europe, i.e. Germany, Holland, France or UK.