Fifth
A modern phonetic spelling of the Latin name Quintus, traditionally given to the fifth child or a child born in the fifth month. It evolved through the Roman family name Quintinus and the English surname Quentin.
Less common today
Quinnten isn't in the latest US Top 1000. It last peaked at #5,450 in 1998.
US births per 5-year period, 1990βpresent (SSA data).