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One website says “Old Norse name (maybe from Old English)” https://www.nordicnames.de/wiki/Sumarli%C3%B0i and it lists Sumarliði as the main form and Sumarliðr as a later variant. The Anglo-Saxon form was Sumerlida (with many variations). An Anglo-Saxon origin seems more likely because both elements were also used in other names: Sælida (sea + sailor), Winterlida (Winter + sailor), Sumerfugol (Summer + bird), although none of these were common. In Anglo-Saxon, lid (or lit, or lith) meant a ship or vessel, so lida was a seaman or sailor. Obviously, if the Anglo-Saxon form is the earliest, then it would have been originally a description of Norsemen who raided in the Summer, subsequently taken up as a personal names. The same thing happened with the word Northman.

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There are some listings of Anglo-Saxons (or Danes) called Sumerlida on these pages:
http://pase.ac.uk/jsp/pdb?dosp=VIEW_RECORDS&st=PERSON_NAME&value=17473&level=1&lbl=Sumerlida
https://archive.org/details/onomasticonangl00seargoog/page/n492
https://archive.org/details/indexsaxonicusa00bircgoog/page/n122
(On that last page, the numbers after the names are not dates, but references to documents.)

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One document http://www.esawyer.org.uk/charter/1448a.html from about 983 or 985 contains this sentence:
“These are

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