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The plural of Shastri would be Shastris
If Hoix is a surname, then the plural is Hoixes
If Gelpi is a surname, then the plural is Gelpis.
The plural of the surname may be Simmons or Simmonses.
The plural of the surname Sarli would be Sarlis.
The plural of bràthair (brother) is bràithrean. (This would not be for the surname Brothers.)
A surname cannot be pluralized.
Neil Bogart's birth name is Neil Bogatz.
To make the surname Justiz plural, you would add an "s" at the end. So it would become Justizs.
To pluralize the surname "Fourness," you would simply add an "es" to the end, making it "Fournesses."
The surname Hester has the plural Hesters (two Hesters, or the Hester family).
In English, the plural is Mullinaxes Other languages make plurals differently.