From en.wiktionary.org:
[flock]
** English
*** Proper noun
[Flocks]
1. [en] .
**** Derived terms
[en]
**** Statistics
- According to the 2010 United States Census, _Flock_ is the 13867 <sup> th </sup> most common surname in the United States, belonging to 2179 individuals. _Flock_ is most common among White (93.07%) individuals.
** German Low German
*** Etymology
From [nds-de], from [nds-de], from [nds-de], from [nds-de]. Cognate with
[en], [is].
*** Noun
[nds-de]
1. [nds-de] crowd , band , group , troop
2. [nds-de] flock
3. [nds-de] group , herd
[en]