The gate or the door
A modern American elaboration of the Latin name Portia. It combines the French-style prefix 'La' with the Roman family name Porcius, which historically referred to a gatekeeper or a pig merchant.
Less common today
Laportia isn't in the latest US Top 1000. It last peaked at #4,834 in 1990.
US births per 5-year period, 1990βpresent (SSA data).