Mark Jackson has the most games by a rookie with 15+ assists, with 13 games in 1987-88.

Interpreted as:

most 15+ assist regular-season game by a rookie

	NAME	GP	AST	SEASON	TM	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	REB	STL	BLK	TOV	PF	+/-
1	Mark Jackson M. Jackson	13	214	1987-88	NYK	41.0	14.5	4.3	16.5	2.5	0.0	5.7	11.8	48.4	0.6	1.7	36.4	2.5	3.1	80.0	55.1	1.1	3.2	3.1	533	188	56	32	0	40	43
2	Tim Hardaway T. Hardaway	8	132	1989-90	GSW	40.5	18.5	4.8	16.5	2.6	0.1	7.0	14.8	47.5	0.1	0.8	16.7	4.4	5.0	87.5	54.6	1.0	3.8	3.1	324	148	38	21	1	25	27
3	Nate McMillan N. McMillan	7	124	1986-87	SEA	36.1	6.9	6.1	17.7	2.9	0.9	2.9	5.6	51.3	0.0	0.1	0.0	1.1	1.3	88.9	55.9	1.7	4.4	3.4	253	48	43	20	6	24	21
4	Jamaal Tinsley J. Tinsley	6	107	2001-02	IND	43.8	12.0	7.3	17.8	2.0	1.5	3.8	12.0	31.9	1.0	3.3	30.0	3.3	4.0	83.3	43.6	1.7	5.7	3.8	263	72	44	12	9	23	28	+4
5	Brevin Knight B. Knight	6	100	1997-98	CLE	35.8	11.0	3.5	16.7	3.8	0.5	3.8	7.0	54.8	0.0	0.2	0.0	3.3	4.0	83.3	62.8	0.7	2.8	3.2	215	66	21	23	3	19	19	+90
6	Gary Grant G. Grant	6	103	1988-89	LAC	38.7	17.2	3.3	17.2	3.0	0.0	6.8	13.5	50.6	0.0	0.0		3.5	4.2	84.0	56.0	1.5	1.8	4.7	232	103	20	18	0	28	15
7	Ennis Whatley E. Whatley	6	111	1983-84	CHI	36.5	10.7	3.3	18.5	2.2	0.2	3.5	8.3	42.0	0.0	0.0		3.7	4.3	84.6	52.1	1.5	1.8	3.8	219	64	20	13	1	23	15
8	Damon Stoudamire D. Stoudamire	5	80	1995-96	TOR	43.4	15.4	5.0	16.0	1.8	0.2	5.8	16.4	35.4	1.4	6.2	22.6	2.4	4.0	60.0	42.4	0.6	4.4	3.4	217	77	25	9	1	17	16
9	Trae Young T. Young	4	64	2018-19	ATL	39.9	27.5	5.5	16.0	0.8	0.5	9.8	23.3	41.9	2.8	8.8	31.4	5.3	6.3	84.0	52.9	1.0	4.5	5.3	160	110	22	3	2	21	5	-16
10	Ben Simmons B. Simmons	4	60	2017-18	PHI	35.6	13.8	9.3	15.0	1.5	1.3	6.5	12.3	53.1	0.0	0.0		0.8	1.5	50.0	53.3	1.3	8.0	2.8	143	55	37	6	5	11	6	+67
11	Darren Collison D. Collison	3	53	2009-10	NOH	46.8	14.3	4.0	17.7	1.7	0.3	5.3	11.7	45.7	0.7	1.3	50.0	3.0	4.0	75.0	53.4	1.0	3.0	4.7	140	43	12	5	1	14	6	-5
12	Davion Mitchell D. Mitchell	2	32	2021-22	SAC	39.8	16.5	2.0	16.0	0.0	1.0	5.5	14.0	39.3	1.5	4.0	37.5	4.0	5.0	80.0	50.9	0.0	2.0	3.0	80	33	4	0	2	6	5	-13
13	Chris Paul C. Paul	2	31	2005-06	NOK	43.2	14.0	8.0	15.5	3.5	0.0	5.5	14.0	39.3	0.0	2.0	0.0	3.0	3.5	85.7	45.0	1.0	7.0	2.5	86	28	16	7	0	5	6	+4
14	Jason Kidd J. Kidd	2	33	1994-95	DAL	39.5	20.0	5.5	16.5	4.0	0.5	5.5	16.0	34.4	1.0	3.0	33.3	8.0	11.5	69.6	47.5	2.5	3.0	5.5	79	40	11	8	1	11	4
15	Sherman Douglas S. Douglas	2	32	1989-90	MIA	32.5	14.0	2.5	16.0	2.0	0.0	6.0	13.0	46.2	0.0	1.0	0.0	2.0	3.0	66.7	48.9	0.5	2.0	3.5	65	28	5	4	0	7	7
16	Kevin Johnson K. Johnson	2	32	1987-88	PHX	38.0	16.0	3.0	16.0	1.5	1.0	6.5	12.0	54.2	0.0	1.0	0.0	3.0	3.5	85.7	59.1	1.0	2.0	1.0	76	32	6	3	2	2	5
17	Kenny Smith K. Smith	2	30	1987-88	SAC	40.5	8.0	3.0	15.0	1.5	0.0	3.0	9.5	31.6	0.0	0.5	0.0	2.0	3.0	66.7	37.0	1.0	2.0	5.0	81	16	6	3	0	10	4
18	Michael Jordan M. Jordan	2	31	1984-85	CHI	45.5	33.5	12.5	15.5	2.0	1.0	11.0	20.5	53.7	0.0	1.5	0.0	11.5	14.0	82.1	62.8	4.0	8.5	4.5	91	67	25	4	2	9	8
19	Keaton Wallace K. Wallace	1	15	2024-25	ATL	37.5	15.0	11.0	15.0	5.0	0.0	7.0	20.0	35.0	1.0	7.0	14.3	0.0	0.0		37.5	0.0	11.0	3.0	37	15	11	5	0	3	3	+5
20	Scoot Henderson S. Henderson	1	15	2023-24	POR	40.5	19.0	3.0	15.0	1.0	0.0	7.0	18.0	38.9	2.0	10.0	20.0	3.0	3.0	100.0	49.2	2.0	1.0	8.0	41	19	3	1	0	8	4	-31
21	Andrew Nembhard A. Nembhard	1	15	2022-23	IND	27.7	15.0	2.0	15.0	0.0	0.0	6.0	15.0	40.0	1.0	4.0	25.0	2.0	2.0	100.0	47.2	0.0	2.0	1.0	28	15	2	0	0	1	2	-10
22	Kris Dunn K. Dunn	1	16	2016-17	MIN	32.3	10.0	2.0	16.0	1.0	2.0	5.0	13.0	38.5	0.0	2.0	0.0	0.0	0.0		38.5	0.0	2.0	3.0	32	10	2	1	2	3	4	+3
23	Trey Burke T. Burke	1	15	2013-14	UTA	40.2	24.0	4.0	15.0	1.0	0.0	10.0	21.0	47.6	2.0	5.0	40.0	2.0	2.0	100.0	54.8	1.0	3.0	3.0	40	24	4	1	0	3	1	-18
24	Brian Roberts B. Roberts	1	18	2012-13	NOH	41.2	13.0	5.0	18.0	1.0	0.0	5.0	10.0	50.0	1.0	4.0	25.0	2.0	2.0	100.0	59.7	0.0	5.0	3.0	41	13	5	1	0	3	3	+21
25	John Wall J. Wall	1	15	2010-11	WAS	40.4	19.0	5.0	15.0	1.0	0.0	7.0	12.0	58.3	0.0	0.0		5.0	7.0	71.4	63.0	1.0	4.0	7.0	40	19	5	1	0	7	2	+12