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Rows:

[enwiki]> select rev_id,rev_user,rev_user_text from revision where rev_user_text='Llama man';
+-----------+----------+---------------+
| rev_id    | rev_user | rev_user_text |
+-----------+----------+---------------+
|  78389563 |  1661697 | Llama man     | 
|  84249212 |  1661697 | Llama man     | 
|  84516223 |  1661697 | Llama man     | 
|  84516296 |  1661697 | Llama man     | 
|  84522073 |  1661697 | Llama man     | 
|  84701538 |  1661697 | Llama man     | 
|  85351963 |  1661697 | Llama man     | 
|  85376173 |  1661697 | Llama man     | 
|  85376332 |  1661697 | Llama man     | 
|  85376424 |  1661697 | Llama man     | 
|  85491623 |  1661697 | Llama man     | 
|  86811665 |  1661697 | Llama man     | 
|  86821394 |  1661697 | Llama man     | 
|  86856767 |  1661697 | Llama man     | 
|  86856892 |  1661697 | Llama man     | 
|  87250572 |  1661697 | Llama man     | 
|  87657503 |  1661697 | Llama man     | 
|  87659254 |  1661697 | Llama man     | 
|  87831643 |  1661697 | Llama man     | 
|  87846046 |  1661697 | Llama man     | 
|  88328657 |  1661697 | Llama man     | 
|  88485090 |  1661697 | Llama man     | 
|  88485222 |  1661697 | Llama man     | 
|  92305529 |  1661697 | Llama man     | 
|  99016388 |  1661697 | Llama man     | 
| 100096806 |  1661697 | Llama man     | 
| 109999894 |  1661697 | Llama man     | 
+-----------+----------+---------------+
27 rows in set (0.00 sec)

Renamed on db36 using:

UPDATE revision SET rev_user_text='Malcom', rev_user=56586 WHERE rev_user_text='Llama man' AND rev_user=1661697 LIMIT 1;

Which created a false name 'Malcom' (my bad):

[enwiki]> select rev_id,rev_user,rev_user_text from revision where rev_user_text='Malcom' and rev_user=56586;
+-----------+----------+---------------+
| rev_id    | rev_user | rev_user_text |
+-----------+----------+---------------+
|  78389563 |    56586 | Malcom        | 
|  80354456 |    56586 | Malcom        | 
|  80551625 |    56586 | Malcom        | 
|  84249212 |    56586 | Malcom        | 
|  84516223 |    56586 | Malcom        | 
|  84516296 |    56586 | Malcom        | 
|  84522073 |    56586 | Malcom        | 
|  84701538 |    56586 | Malcom        | 
|  85351963 |    56586 | Malcom        | 
|  85376173 |    56586 | Malcom        | 
|  85376332 |    56586 | Malcom        | 
|  85376424 |    56586 | Malcom        | 
|  85491623 |    56586 | Malcom        | 
|  86811665 |    56586 | Malcom        | 
|  86821394 |    56586 | Malcom        | 
|  86856767 |    56586 | Malcom        | 
|  86856892 |    56586 | Malcom        | 
|  87250572 |    56586 | Malcom        | 
|  87657503 |    56586 | Malcom        | 
|  87659254 |    56586 | Malcom        | 
|  87831643 |    56586 | Malcom        | 
|  87846046 |    56586 | Malcom        | 
|  88328657 |    56586 | Malcom        | 
|  88485090 |    56586 | Malcom        | 
|  88485222 |    56586 | Malcom        | 
|  92305529 |    56586 | Malcom        | 
|  99016388 |    56586 | Malcom        | 
| 100096806 |    56586 | Malcom        | 
| 109999894 |    56586 | Malcom        | 
+-----------+----------+---------------+
29 rows in set (0.00 sec)

Fixed the username with :

UPDATE revision SET rev_user_text='Malcolm' WHERE rev_user_text='Malcom' AND rev_user=56586 LIMIT 1;