search for column name in psql
select t.table_schema, t.table_name from information_schema.tables t inner join information_schema.columns c on c.table_name = t.table_name and c.table_schema = t.table_schema where c.column_name = 'last_name' and t.table_schema not in ('information_schema', 'pg_catalog') and t.table_type = 'BASE TABLE' order by t.table_schema;