The fifth
A modern American creation combining the prefix 'La-' with the name Quentin. Quentin is derived from the Latin 'Quintus', historically given to the fifth child or a child born in the fifth month.
Less common today
Laquentin isn't in the latest US Top 1000. It last peaked at #4,875 in 1990.
US births per 5-year period, 1990βpresent (SSA data).