O ystyried y cyd-destun ar gyfer gwaith y Comisiynydd a’r achos y bydd yn eiriolwr drosto, mae’n bwysig bod gan y Comisiynydd y sgiliau ieithyddol sydd eu hangen i gyflawni ei ddyletswyddau yn effeithiol. O dan y rheoliadau hyn rhaid bod Prif Weinidog Cymru wedi ei fodloni bod gan y person wybodaeth ddigonol o’r Gymraeg a hyfedredd digonol ynddi i arfer swyddogaethau’r Comisiynydd. I’r perwyl hwn mae’r rheoliadau yn ei  gwneud hi’n ofynnol i’r panel dethol asesu gwybodaeth pob ymgeisydd o'r Gymraeg a'i hyfedredd ynddi, a chynnwys yr asesiad yn ei argymhellion i Brif Weinidog Cymru.  Bydd yr asesiad hwn o gymorth i roi’r sicrwydd y mae gofyn i Brif Weinidog Cymru  ei chael er mwyn iddo deimlo’n fodlon bod yr ymgeisydd llwyddiannus yn gallu arfer ei swyddogaethau’n effeithiol.
Given the context within which the Commissioner will be working and the cause which he or she will be championing, it is important that the Commissioner has the necessary language skills to effectively carry out his or her duties. Before making an appointment, the First Minister is required under these regulations to be satisfied that the person has sufficient knowledge of, and proficiency in, the Welsh language to exercise the functions of the Commissioner. To this end, the regulations require the selection panel to assess each candidate’s knowledge of and proficiency in the Welsh language and include the assessment in its recommendations to the First Minister.  This assessment will help provide the First Minister with the assurance he will require to be satisfied that the successful candidate is able to exercise his or her functions effectively.