OK, let's go with that.

gg5: "尾形とかいう人　a person called Ogata, or something (like that); a person called, I believe, Ogata; a certain Mr. Ogata; one [a] Mr. Ogata."

How about "uncertain information"? Even in that context, とか is being used to express some degree of uncertainly about the person's name.

@@ -20 +20 @@
-<s_inf>used to convey hearsay or unconfirmed information; oft. with 言う, 聞く, etc.</s_inf>
+<s_inf>used to convey hearsay or uncertain information; oft. with 言う, 聞く, etc.</s_inf>

Tanaka: きのうウィリアムズさんとかいう人が訪ねてきました。A Mr. Williams came to see you yesterday.

Looks good. My only concern is the rather common use of it to announce people. 7 of the 67 indexed Tanaka sentences have this pattern and while it sort-of fits into sense 2 with its "a (certain)", it's not really "hearsay or unconfirmed information"; it's more a formula used in such situations. I wonder if the sense can be tweaked a little to reflect that usage?

daij, meikyo, gg5, prog

These are all the senses in the kokugos.
Sense 2 and 3 are really the same sense, but "I hear that/rumor has it", etc. only work when the sentence *ends* with とか (as in the examples in Nicolas's link) which is why I've kept them separate.
Sense 4 looks similar to sense 2 except that it's not used for hearsay. Only daijs and meikyo have it as a separate sense. Daijr has a note about it.

@@ -10,0 +11,3 @@
+<s_inf>oft. as ...とか...とか</s_inf>
+<gloss>and the like</gloss>
+<gloss>such as</gloss>
@@ -12,2 +14,0 @@
-<gloss>such things as</gloss>
-<gloss>or something like that</gloss>
@@ -18,5 +19,22 @@
-<s_inf>often with 言う</s_inf>
-<gloss>people say that</gloss>
-<gloss>it is said that</gloss>
-<gloss>I hear that</gloss>
-<gloss>rumor has it that</gloss>
+<pos>&prt;</pos>
+<s_inf>used to convey hearsay or unconfirmed information; oft. with 言う, 聞く, etc.</s_inf>
+<gloss>or something</gloss>
+<gloss>something like</gloss>
+<gloss>a (certain)</gloss>
+</sense>
+<sense>
+<pos>&exp;</pos>
+<pos>&prt;</pos>
+<s_inf>at sentence end</s_inf>
+<gloss>I hear that ...</gloss>
+<gloss>people say that...</gloss>
+<gloss>rumour has it that ...</gloss>
+</sense>
+<sense>
+<pos>&exp;</pos>
+<pos>&prt;</pos>
+<misc>&col;</misc>
+<s_inf>used to make a statement vague or less absolute; usu. after a noun</s_inf>
+<gloss>or something</gloss>
+<gloss>something like</gloss>
+<gloss>or whatever</gloss>

GG5: (1) …or something; a (certain)…   (2) …and the like; …and so on
中辞典; (1) example: 尾形とか(なんとか)いう人 a (certain) Mr. Ogata; somebody named Ogata 《wants to see you》
彼女は今病気療養中とかいう話だ. ┏I hear [They say] she's recovering from an illness.
中辞典; (2) 鍋とか釜とかその他いろいろな炊事道具 various kitchen utensils such as pots and pans and so on
Makino & Tsutsui (DBJG) and Chino (All About Particles) take differing analyses of this one.

I agree it nees to be (at least) two senses and I think Nicolas' suggestion is pretty good. Any other suggestions?

@@ -13,0 +14 @@
+<gloss>and so on</gloss>
@@ -16,0 +18 @@
+<s_inf>often with 言う</s_inf>