I didn't find anything for this season, but Kristaps Porziņģis had the most blocks per game in the NBA Finals with 1.7 per game.

Interpreted as:

Who led this last finals in blocks?

	NAME	BPG	SERIES	GP	MPG	PPG	RPG	APG	SPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	REB	AST	STL	BLK	TOV	PF	+/-
1	Kristaps Porziņģis K. Porziņģis	1.7	NBA Finals	3	20.0	12.3	3.7	0.3	0.0	4.7	8.0	58.3	0.7	3.0	22.2	2.3	2.7	87.5	67.2	0.0	3.7	0.3	60	37	11	1	0	5	1	5	+33
2	Neemias Queta N. Queta	1.0	NBA Finals	1	5.4	2.0	0.0	0.0	0.0	1.0	1.0	100.0	0.0	0.0		0.0	0.0		100.0	0.0	0.0	0.0	5	2	0	0	0	1	0	0	+7
3	Xavier Tillman Sr. X. Tillman Sr.	1.0	NBA Finals	2	9.3	3.0	2.5	0.5	0.0	1.0	1.5	66.7	0.5	0.5	100.0	0.5	0.5	100.0	87.2	1.0	1.5	0.5	19	6	5	1	0	2	1	3	-4
4	Derrick White D. White	1.0	NBA Finals	5	36.7	13.8	4.8	2.6	1.2	4.2	10.8	38.9	3.4	8.6	39.5	2.0	2.0	100.0	59.1	1.4	3.4	1.2	184	69	24	13	6	5	6	11	-14
5	Jaylen Brown J. Brown	0.8	NBA Finals	5	38.5	20.8	5.4	5.0	1.6	7.4	16.8	44.0	1.6	6.8	23.5	4.4	6.0	73.3	53.5	0.8	4.6	2.8	193	104	27	25	8	4	14	16	+14
6	Jrue Holiday J. Holiday	0.6	NBA Finals	5	37.8	14.4	7.4	3.8	0.6	6.0	11.2	53.6	1.6	3.8	42.1	0.8	0.8	100.0	62.3	2.6	4.8	1.4	189	72	37	19	3	3	7	14	+10
7	Al Horford A. Horford	0.6	NBA Finals	5	30.0	7.0	6.2	2.6	1.2	2.6	5.0	52.0	1.6	3.4	47.1	0.2	0.4	50.0	67.6	1.0	5.2	0.6	150	35	31	13	6	3	3	9	+8
8	Derrick Jones Jr. D. Jones Jr.	0.6	NBA Finals	5	23.2	6.6	2.8	0.6	0.6	2.6	6.0	43.3	0.6	2.4	25.0	0.8	1.0	80.0	51.2	1.0	1.8	0.2	116	33	14	3	3	3	1	6	-15
9	Jayson Tatum J. Tatum	0.6	NBA Finals	5	40.2	22.2	7.8	7.2	1.0	7.6	19.6	38.8	2.0	7.6	26.3	5.0	5.4	92.6	50.5	0.8	7.0	3.2	201	111	39	36	5	3	16	11	+6
10	P.J. Washington Jr.	0.6	NBA Finals	5	32.6	10.8	6.2	1.4	0.0	3.6	8.8	40.9	1.2	4.4	27.3	2.4	3.2	75.0	52.9	1.2	5.0	1.8	163	54	31	7	0	3	9	16	-28
11	Daniel Gafford D. Gafford	0.6	NBA Finals	5	14.8	8.0	4.4	0.4	0.2	3.2	4.4	72.7	0.0	0.0		1.6	2.4	66.7	73.3	1.8	2.6	0.2	74	40	22	2	1	3	1	4	-16
12	Oshae Brissett O. Brissett	0.3	NBA Finals	3	6.2	2.3	1.0	0.0	0.0	0.7	1.3	50.0	0.3	0.3	100.0	0.7	0.7	100.0	71.7	0.3	0.7	0.0	19	7	3	0	0	1	0	0	-3
13	Maxi Kleber M. Kleber	0.2	NBA Finals	5	15.9	1.8	1.4	0.6	0.2	0.6	2.4	25.0	0.2	1.2	16.7	0.4	0.4	100.0	34.9	0.2	1.2	0.2	80	9	7	3	1	1	1	8	-14
14	Dereck Lively II D. Lively II	0.2	NBA Finals	5	22.8	5.6	8.2	0.4	0.8	2.4	3.4	70.6	0.2	0.2	100.0	0.6	1.4	42.9	69.7	3.2	5.0	1.0	114	28	41	2	4	1	5	11	-10