Heredia is a place-name and surname stemming from the singular Latin noun (plural: ). However, different evolution paths have been postulated for the word, even different origins. 
Hereditary land.
According to Belgian economist Émile Louis Victor de Laveleye, the was "land transmitted hereditarily". 
The symbolized "the continuity between one generation of citizens and the next". 
In "Apellidos vascos", linguist Koldo Mitxelena postulates a similar "heredium" root for the surname and village Heredia in the Basque Country, attested as Deredia for small place-names in Basque, due to prothesis, in the same way as Basque surname and place-name "Gerediaga".
Other words related to include:
Unit of measurement.
A is also an Ancient Roman unit of measurement, approximately equivalent to 1.246 acres or 5060 square meters. 
Herod.
On the other hand, Flavius Josephus believes that "heredium" was a name given to a costly citadel in memory of Herod's great actions, as Herod "adorned it with the most costly palaces, and erected very strong fortifications" ("", page 48).
Likewise, the "History of Free Masonry" claims that Heredia is a name derived from Herod the Great and his Herodian Kingdom.
References.
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