Longster Name Meaning
Of uncertain origin; perhaps a locative name from Langscar in Malham (WR Yorks) which is recorded as Langester (or Langescer) in about 1190 but the medieval record is otherwise silent. possibly a variant of Longstaff .
Longstaff Name Meaning
English (mainly northeastern): variant of Langstaff .
Langstaff Name Meaning
English (mainly northeastern): nickname from Middle English lang ‘long’ + staf ‘staff’ perhaps a nickname for a bailiff or other officer of the law. Compare Longstaff .
Source:
The Oxford Dictionary of Family Names in Britain and Ireland, 2016
Similar surnames:
Sangster, Linster, Longaker, Oster, Fenster, Forster, Koster, Langner
From: https://www.ancestry.co.uk/learn/facts