Responsa for Yevamot 73:17

אביי סבר לה כשמואל דאמר הלכה כהלל ומוקי לה רבי אליעזר בן יעקב אליבא דהלכתא כי היכי דלא תקשי הלכתא אהלכתא

nor those of doubtful, with those of confirmed illegitimacy; nor those of doubtful, with others of doubtful illegitimacy. And the following are of doubtful legitimacy: The shethuki,<span class="x" onmousemove="('comment',' [H] (rt. [H] 'to be silent'), he who knows his mother but does not know who was his father (v. Kid. 6); who 'keeps silent' about his origin. ');">⁴¹</span> the asufi<span class="x" onmousemove="('comment',' [H] (rt. [H] 'to gather') a child picked up in the street, and whose fatherhood and motherhood are unknown (v. Kid. l.c.); 'a foundling'. ');">⁴²</span> and the Samaritan.<span class="x" onmousemove="('comment',' Kid. 74a. In all these cases the legitimacy is doubtful: in the first two, because the father is unknown; and in the last, because the Samaritans did not observe all the laws of betrothal, and any Samaritan might be the issue of an illicit union between his father and a woman who had been legally betrothed to another man. ');">⁴³</span>

Teshuvot Maharam