Edgar sits next to 4 phonetic neighbors — Edward, Edwin, and Edgard are the closest matches by sound. Most share Edgar's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"rich spear, lucky warrior"
"hillside dweller"
"appointed, placed by God"
"home ruler"
"manly, brave"
"from Brix (place name)"
"ancient, enduring"
"son of Emery"
"red (hair color)"
"light"
"from the island of Rhodes"
"gift, from the sea"
"shallow river crossing"
"increase, growth"
"high-spirited person"
"strife, war"
"supplanter"
"dark-skinned, Moorish"
"from Laurentum, laurel-crowned"
"strong spear-fighter"
"Beauty, grace"
Similar sound: These names share phonetic patterns with Edgar — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Edgar.
Rhythm: Edgar is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.