Old Norse is very different, and separate from old Danish/Anglian. There are two accepted views of the Viking settlement in Britian, The Norse, Vikings mainly the Northern isles and western coasts of Britian, including Cumbria, the Wirrel, and parts of Ireland, isle of man, and small influences further East towards the North Yorkshire coast. The Danes/Swedish Vikings etcs who for the most parts were the descendants/same people as the Angle's left a larger influence of our Language etc.
It is the early movements of these people into Britian no doubt following the coastal area's down such as Frisea etc,from their Northern Homelands as the springboard to the East coasts of Britian. These connections and movements in my own opinion, must have continued through out for hundreds of years, as the coinage shows, ie ' many seventh and eight century Sceats ( Silver coins )etc found in Britian have mints in Frisea and the mouth of the Rhine river, such as Dorstad etc.
The Scandinavian element of 'Anglian settlement' is proved beyond question in East Anglia, and then further up the Northern East Coast of England. The Sutton Hoo, (Anglian) and ( Uppsala 'Vendel ), Swedish '. Beowulf itself proves this close cultural connection with the Anglian Settlements, very separate from the Saxon settlement although there is a connection with Hengest etc.
'Ham' endings arrived later with or followed on from the, ingas names, prior to ton endings, there was certianly overlap of the Saxon' in the South East of Anglia, Suffolk etc, and no doubt these namings were influenced, they are also many Ham endings in Sweden/Denmark today that no doubt have long and ancient foundations. Taken together these name endings can be traced and dated historically and culturally, and actually serve as a tool to dating settlements.
'Ham' names in Sweden for Instance - HargsHamn, Bylehamn, Grisslehamn, Bergshamra, OskarsHamn, KarlsHam, Kristinhamn, Osthamar, to name a few, although slightly differing they are the same meaning. 'Copenhagen' Denmarks capital city was earlier known as Kopmann's Hamn. there are also many 'ton' names in these countries that may also have origins much earlier than believed. Sigtuna, a famous Swedish trade centre.
Regarding the inga's naming, if for instance you follow the Anglian settlements of the early fifth and sixth centuries you will follow and clearly Identify settlement names such as 'Esa', 'inga's ton, ie Easington. The Modern named Easingtons, have evolved and developed with a later 'ton' ending, but the original name can be followed up the whole east coast of England, from the original area's of the first anglian settlements. Easington is one of many such footprints, and as it is recognised as an early inga's, name it could well be a memory reference to Esa/Eosa/Oesa, the Grandfather of Ida. ( Strangly enough, in the nearest Easington to myself, there is also a road known as Glappa Gate, this also could be a rememberence/reference to the succesor to King Ida.
You only have to look at any Swedish map today to find many 'Ing'/Ing's ending names today, and Sweden has never suffered a large scale language/cultural change such as in Britian. I only mention the Swedish/Danish connections, because of my own visits to Denmark and Sweden where I was shocked by the similarity with names in my own country, and these two countries have been tied culturally for many hundreds of years.
'Ida' the well know king of the northern kingdon of Bernicia, (died 559 ) later Northumberland, had a grandfather named Esa/Eosa/Oesa, and he may well be the, founder of the original early settlement names of Easington, from, East Anglia,Lincoln, Yorkshire, Co Durham, Northumberland, all settled on the east coast of England, this may reflect a settlement history, of Esa and his people progressing North from an original East Anglian founding.
Archaeological findings such as cruciform and square headed brooch's, are Identified as culturally Anglia/Scandinavian, confirm some of these settlements to be Anglian as early grave finds relating to the Angles have been associated with first generation incomers.late fifth and early sixth century.
There are many versions through history of the name Easington regarding the first element of this name, but its root form is from 'Esa/Oesa/Eosa and Inga's, 'the people/followers of Esa/Oesa/Eosa' which is the most likely origin.
A lot of DNA studies into Anglo-Saxon peopling of Britian, may prove this as more people test, but after the Norman conquest, many fled from the Eastern coasts, and other area's,from what was basically Brutal 'ethnic cleansing' .People moved Inland and North, many to Scotland, and some even left the country, many to Flanders, and further, this may also have an effect on the DNA findings, and may represent a back migration into these regions. People that stayed or were found or come across, were wiped out completely, these were large population deliberate destructions, especially in the North and East, records exist proving that actions such as the 'Harrying of the North' did happen, and its consequences may still be found by DNA today.
These area's were left many years desolate, and then repopulated by many different people, no doubt altering the original language dialects, and gene pool of DNA from the original settlers. It is not suprising that a lot of Anglian/Viking DNA, is missing, but the actual influence of Viking influences have to be considered along side the Anglian influence as in my opinion they cannot be separated in the way they are. The Norse settlement is a very different issue, as I believe it was influenced by dialects further up the Western and Northern islands of the coast of Norway, and although similar is clearly differing.
I believe there are far more words/language connections, and dialects from the Anglian/Viking settlements than is stated today, and soon the true impact will be lost as local dialects, words, and sounds completely dissapear in the next few generations.