There is a lot of information that shows that quite a number of people
with the name Derrick (actually, early variants)
came from the Low Countries in the 17th century. I believe that this movement
was connected with the Hugenots. Whether this all Derrick families in Britain
were derived from immigrants I cannot say. I only know that I have references
to Derricks in Britain going back to the 15th century, and that Derricks
were established in Somerset villages in the 16th century. Hence, either
the name was native or the immigration had occurred hundreds of years before
the Hugenots.
Although the Derrick name is spelled in only one way today (to my knowledge), many variants existed in the past. Unification to the Derrick form occurred about 1800, with the greatest diversity occurring in the 17th century and earlier.
Variations occurred both between and within locations. In the village of Ubley in Somerset, the form Dirrick was used almost exclusively from the beginning of the parish register in the late 1600s until the early 1800s, at which time the Derrick form replaced it. (I was told that up until fairly recently some in the area still pronounced the name with a short 'i' sound as in Dirrick.) On the other hand, at Blagdon, which is only a few miles away from Ubley, the Derrick form prevailed, with Dirrick tending to be used for immigrants and descendant families from Ubley. Other villages were totally inconsistent. At Whitchurch in Somerset, for instance, the following forms were used: Derock (1609), Dyrrocke (1620), Dirrecke (1636), Dirrocke (1669), Derrick (1680), Diricke (1758), while Dirrick was used as well. In general, forms with 'y' (sometimes, two 'y's - Dyrrycke) and the final 'e' were used in the 17th century and earlier.
I should also mention that the Derrick name appears to have been adopted
by immigrants to the United States whose names were somewhat similar in
either sound or look.
I have also encountered a name change from Darroch to Derrick, caused by
immigration officials into Australia. The family was originally from Scotland,
and probably had no connections with any true Derrick family.
Derrick, on a spear-head a savage's head couped and dripping blood ppr. Virtute non viribusI have no further information about this crest and would be interested to hear which family instituted it, and when.