Ron Harper has the most turnovers by a rookie with 345 turnovers in 1986-87.

most turnovers in the rookie season
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1986-87Harper1996-97Iverson1978-79Ford1994-95Robinson1977-78King2018-19Young1992-93O'Neal1999-00Francis1979-80Johnson1978-79Theus1981-82Thomas1983-84Sampson1993-94Hardaway1984-85Jordan1977-78Davis1981-82Tripucka1997-98Duncan1985-86Malone2017-18Simmons1992-93Laettner2008-09Westbrook2003-04James345337323313311308307306305303299294292291283280279279278275274273
NAMESEASONTMGPTOVMPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKPF+/-
Ron HarperRon Harper1986-87CLECLE8234537.422.94.84.82.51.04.29.019.745.50.21.121.34.76.968.43,0641,87439239420984247
Allen IversonAllen Iverson1996-97PHIPHI7633740.123.54.17.52.10.34.48.219.841.62.06.034.15.07.270.23,0451,78731256715724233-439
Phil FordPhil Ford1978-79KCKKCK7932334.515.92.38.62.20.14.15.912.746.54.15.181.32,7231,2601826811746245
Glenn RobinsonGlenn Robinson1994-95MILMIL8031337.021.96.42.51.40.33.98.017.645.11.13.432.15.06.279.62,9581,75551319711522234
Bernard KingBernard King1977-78NJNNJN7931139.124.29.52.41.50.53.910.121.147.94.05.867.73,0921,90975119312236302
Trae YoungTrae Young2018-19ATLATL8130830.919.13.78.10.90.23.86.515.541.81.96.032.44.25.182.92,5031,5493016537215140-336
Shaquille O'NealShaquille O'Neal1992-93ORLORL8130737.923.413.91.90.73.53.89.016.156.20.00.00.05.38.959.23,0711,8931,12215260286321
Steve FrancisSteve Francis1999-00HOUHOU7730636.118.05.36.61.50.44.06.514.544.51.44.034.53.74.778.62,7761,38840950711829231-158
Magic JohnsonMagic Johnson1979-80LALLAL7730536.318.07.77.32.40.54.06.512.353.00.10.422.64.96.081.02,7951,38759656318741218
Reggie TheusReggie Theus1978-79CHICHI8230333.616.32.85.21.10.23.76.513.648.03.24.276.12,7531,3382284299318270
Isiah ThomasIsiah Thomas1981-82DETDET7229933.817.02.97.82.10.24.26.314.842.40.20.828.84.26.070.42,4331,22520956515017253
Ralph SampsonRalph Sampson1983-84HOUHOU8229432.821.011.12.00.92.43.68.716.752.30.00.025.03.55.366.12,6931,72091316370197339
Anfernee HardawayAnfernee Hardaway1993-94ORLORL8229236.816.05.46.62.30.63.66.213.346.60.62.326.73.04.074.23,0151,31343954419051205
Michael JordanMichael Jordan1984-85CHICHI8229138.328.26.55.92.40.83.510.219.851.50.10.617.37.79.184.53,1442,31353448119669285
Walter DavisWalter Davis1977-78PHXPHX8128332.024.26.03.41.40.23.59.718.452.64.85.883.02,5901,95948427311320242
Kelly TripuckaKelly Tripucka1981-82DETDET8228037.521.65.43.31.10.23.47.815.649.60.10.322.76.07.679.73,0771,7724432708916241
Tim DuncanTim Duncan1997-98SASSAS8227939.121.111.92.70.72.53.48.615.754.90.00.10.03.95.966.23,2041,73197722455206254+429
Karl MaloneKarl Malone1985-86UTAUTA8127930.614.98.92.91.30.53.46.212.549.60.00.00.02.45.048.12,4751,20371823610544295
Ben SimmonsBen Simmons2017-18PHIPHI8127833.715.88.18.21.70.93.46.712.354.50.00.10.02.44.256.02,7321,27965966114070211+385
Christian LaettnerChristian Laettner1992-93MINMIN8127534.918.28.72.81.31.03.46.213.147.40.00.510.05.76.883.52,8231,47270822310583290
Russell WestbrookRussell Westbrook2008-09OKCOKC8227432.515.34.95.31.30.23.35.313.439.80.41.627.14.35.281.52,6681,25639943511016191-272
LeBron JamesLeBron James2003-04CLECLE7927339.520.95.55.91.60.73.57.918.941.70.82.729.04.45.875.43,1221,65443246513058149-144
Jamaal TinsleyJamaal Tinsley2001-02INDIND8027030.59.43.78.11.70.53.43.69.538.00.52.224.01.62.370.42,44275129864713840248+43
Mitch RichmondMitch Richmond1988-89GSWGSW7926934.422.05.94.21.00.23.48.217.546.80.41.136.75.26.481.02,7171,7414683348213223
DeMarcus CousinsDeMarcus Cousins2010-11SACSAC8126828.514.18.62.51.00.83.35.312.443.00.00.216.73.45.068.72,3091,1436992048568332-261
StatMuse has season-level data for turnovers going back to the 1977-78 season.