Why is Sheffield Utd called Sheffield Utd?

Named after the Sheffield United Cricket Club, the first English sports club to use 'United' in its name.

Who is the Sheffield Utd rival?

Sheffield Wednesday (Steel City derby), historically Leeds United.

Yes, multiple times from the top flight, including recently.

Bramall Lane, Sheffield

1889

England

Bramall Lane, Sheffield

#	Team	P	W	D	L	PTS	DIFF	GLS	LAST 5
1	Coventry	46	28	11	7	95	+52	97:45	W W W D D
2	Ipswich	46	23	15	8	84	+33	80:47	W D D W D
3	Millwall	46	24	11	11	83	+15	64:49	L D W D W
4	Southampton	46	22	14	10	80	+26	82:56	W D W D D
5	Middlesbrough	46	22	14	10	80	+25	72:47	L L D D W
6	Hull City	46	21	10	15	73	+4	70:66	W W D W L
7	Wrexham	46	19	14	13	71	+4	69:65	D L W W L
8	Derby	46	20	9	17	69	+8	67:59	L W L W L
9	Norwich	46	19	8	19	65	+7	63:56	L D W W L
10	Birmingham	46	17	13	16	64	+1	57:56	D W W D W
11	Swansea	46	18	10	18	64	-2	57:59	W D W L W
12	Bristol City	46	17	11	18	62	0	59:59	W L D L D
13	Sheffield Utd	46	18	6	22	60	0	66:66	W L L W W
14	Preston	46	15	15	16	60	-7	55:62	L W L L W
15	QPR	46	16	10	20	58	-12	61:73	L L L L D
16	Watford	46	14	15	17	57	-12	53:65	L L L L L
17	Stoke City	46	15	10	21	55	-5	51:56	L L L L D
18	Portsmouth	46	14	13	19	55	-15	49:64	D W L W W
19	Charlton	46	13	14	19	53	-14	44:58	L W L D L
20	Blackburn	46	13	13	20	52	-14	42:56	L W D L D
21	West Brom	46	13	14	19	53	-10	48:58	L D W W D
22	Oxford United	46	11	14	21	47	-14	45:59	L W L L W
23	Leicester	46	12	16	18	52	-10	58:68	W D D L L
24	Sheffield Wednesday	46	2	12	32	18	-60	29:89	W L L D D