The query below lists the VM sizes on the given location and filters it with the size name:
az vm list-skus \
--location southindia \
--resource-type virtualMachines \
--query "[?starts_with(name, 'Standard_D2s_')].{
Size:name,
Family:family
}" \
--output table
Size Family
--------------- ------------------
Standard_D2s_v3 standardDSv3Family
Standard_D2s_v4 standardDSv4Family
Standard_D2s_v5 standardDSv5Family
Standard_D2s_v6 StandardDsv6Family