Just do:
UPDATE <TABLE-NAME> SET <COLUMN-NAME> = 'House Number' WHERE <COLUMN_MAME> = 'House Name'
This, of course, will only work if the column contains only this row. Otherwise, you should use the replace function, as Fayeq pointed out, in your update statement above
UPDATE <TABLE-NAME> SET <COLUMN-NAME> = REPLACE('House Name', 'Name', 'Number') WHERE <COLUMN_MAME> = 'House Name'
EDIT :
You can omit the WHERE
if all rows contain the same row (house number)
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