Where does “Terpstra” come from?

Terpstra (Dutch) comes from West Frisian Terpstra, from West Frisian terp, from Old Frisian thorp, from Proto-Germanic þurpą, from Proto-Indo-European treb- — settlement, dwelling; to build, dwell.

Ancestry of “Terpstra”, step by step

Step	Language	Word	Meaning
1	West Frisian	Terpstra	—
2	West Frisian	terp	artificial mound or hillock used as shelter...
3	Old Frisian	thorp	—
4	Proto-Germanic	þurpą	village, rural settlement; gathering of people;...
5	Proto-Indo-European	treb-	settlement, dwelling; to build, dwell

Every word from Proto-Indo-European treb- →Every word from Proto-Germanic þurpą →Every word from Old Frisian thorp →