“The test for misnomer was set out by K.M. van Rensburg J. (as she then was) in Spirito v. Trillium Health Centre, [2007] O.J. No. 3832 (S.C.J.); aff’d 2008 ONCA:
“3 The test for determining whether an amendment is for misnomer or for the addition of a new defendant is whether the “litigating finger” is pointed at the proposed defendant in the Statement of Claim; that is, would a person having knowledge of the facts be aware of the true identity of a misnamed party by reading the Statement of Claim? If so, the defendant will be substituted unless there is prejudice that cannot be compensated for in costs or by an adjournment (Davies v. Elsby Brothers Ltd., [1960] 3 All E.R. 672; Moreau v. Northwestern General Hospital (1988), 1988 CanLII 4810 (ON SC), 65 O.R. (2d) 128; Rakowski et al. v. Mount Sinai Hospital et al. (1987), 1987 CanLII 4113 (ON SC), 59 O.R. (2d) 349; McArthur v. Kaal, [2006] O.J. No. 1525). The alleged expiry of a limitation period cannot be set up as “prejudice” where the initial claim against the misnamed defendants was made within the limitation period (Kitcher et al. v. Queensway General Hospital et al., 1997 CanLII 1931 (ON CA), [1997] O.J. No. 3305).”
More recently in Loy-English v. The Ottawa Hospital, 2019 ONSC 6075, MacLeod J. summarized the law of misnomer:
“19…e. To be a misnomer, the plaintiff must clearly have intended to sue the proposed defendant. The pleading must be drafted with sufficient particularity that an objective and generous reading of the pleading would demonstrate that the “litigation finger” is pointing at the proposed defendant. To put this another way, the pleading must be sufficiently clear that a properly informed defendant reading the allegation would be able to recognize that he or she was the target of the allegation. The allegation must be clear and definite on its face and not held together through a series of assumptions about what the person reading the statement of claim might know.”
As Glustein J. held in Loblaw, limitation period defences do not apply:
13 The distinction between Rule 5.04(2) and Rule 26.02 is further demonstrated by the settled law that limitation period defences do not apply to a motion to correct a misnomer. Due diligence of the plaintiff (or a defendant) would be irrelevant. Even if a party knew of the existence of the proper name of the defendant, an incorrect name or a John Doe pleading based on no pleaded knowledge of the defendant can still be cured at any time provided the “litigating finger” test is met and there is no non-compensable prejudice arising from the misnomer (Stechyshyn v. Domljanovic, 2015 ONCA 889 at paras. 1, 17, 19; Skribans v. Nowek, 2012 ONSC 532 at paras 30, 34, 41).
…
24 Consequently, even if the plaintiff knew the identity of the defendant (e.g. the name of the emergency room as in Ormerod or the proper municipality as in Lloyd v. Clark, 2008 ONCA 343 (CanLII), 2008 O.J. No. 1682 (CA)), the plaintiff (or the defendant, as I discussed above) could still substitute the proper name of the defendant despite the passage of the limitation period. Knowledge of the defendant or discoverability does not impact the analysis on misnomer, subject to the courts’ discretion (Skribans v. Nowek, 2012 ONSC 532 (Mast.), at para. 37).”
MacLeod J. provided the following guidance regarding the effect of notice in Loy-English:
“19…f. Notice to the defendant within the limitation period cannot be a factor in deciding whether or not misnomer applies for the simple reason that, as discussed earlier, there is no requirement to serve a defendant within the limitation period. The question is not whether the defendant did know he or she was being sued but whether on a fair reading of the claim he or she would have known.
g. Notice is relevant to the question of prejudice and the exercise of discretion. Actual notice to the proposed defendant will generally obviate any injustice in subsequently correcting the misnomer. Delay is also relevant to the issue of prejudice and to the exercise of discretion.
h. Notice may be sufficient if the claim against an unknown party has been brought to the attention of the named defendant and to an employer, organization or insurer with the means to determine who was involved in the alleged acts or omissions. In that case it may not be unfair to correct the misnomer once the identity of the other defendant is known even in the absence of actual notice.””
Abraham v. Doe, 2023 ONSC 1232 (CanLII) at 20-23