PRSHNI x FJORGYNN ?

From: João Simões Lopes Filho
Message: 4657
Date: 2000-11-12

The John Dowson"s Classical Dic. of Hindu Mythology and Religion mentions this:
PRSHNI: - In The Vedas and Pura:nas, the earth, the mother of the Maruts. The name us used in the Vedas also for a cow.
 
Prshni: < *PRK'NI: , usually given as meaning "spotted".
 
With e-grade we have *PERK'nNI > ON Fjo"rgyn , also  the Earth.
Coincidence?
An IE Earth-Goddess?
 
In many IE mythologies the Earth has a kind of partner (sometimes a consort, sometimes a brother or a son)
Indians : PR:THVI <=> VARA:HA (Boar-man Vishnu)
Norse : FJOERGYN <=> FJOERGUNN
Greece : DE:ME:T:ER <=> POTIDAHON
Roma : TELLUS <=> TELLUMUS
Ireland: DAN  <=> DAGDA
Wales: DON <=> MATH
Lithuania : ZEMES MATI <=> ZEMES PATI
 
Any IE trait? Any non-IE or pre-IE trait ? Or just another arbitrary coincidence?
Please send me sugestions...
 
Joao SL
Rio