Teagan is technically unisex. I know that, at least where I live, it has gained some noticce because of the girl group Teagan and Sara. I'm not sure of the pronunciation. I know the singer is "tee-gen" with the 'g' making the same sound as in girl. However, it is a diminutive of the name Tadhg, according to Behind the Name, which tends to be fairly reputable, and that name is said "TIEG," as is the name Teague. Based on that, I would guess the correct pronunciation for Teagan is "tie-gen."
I usually see Teagan and Taryn on girls now (I work in Peds, also my sister is a Taryn). They definitely can both be for either but I think in the U.S. and Canada both of those are used more on girls, just as a heads up. =)
Teagan is originally masculine, as you said it is a diminutive for Tadhg, a strictly male name. I don't think I've heard it pronounced any way other than Tee-gen, but Tie-gen sounds legit based on where it came from. Tegan, on the other hand, is a fully female name, as in Tegan & Sara.
Thorley Tobin Travers Trevelyan Theo Terrence Terrell / Terell Tatton Thad Tal Tarben (I don't know what it is I like about this one. It's Danish.) Tasgall / Taskill Taylan (This isn't as trendy as it looks. It's a real Turkish name. You can google it.) Thales Tor (I'm a fan of this for some reason.) Tobiah / Tobias Torben Trafford Trenton Tully
I'm sure you can find even more here, but I'm too lazy to look. http://www.behindthename.com/
no subject
Date: 2011-11-11 05:01 am (UTC)Theo
Tyson
Taylor
Tate
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Date: 2011-11-11 05:08 am (UTC)no subject
Date: 2011-11-11 05:14 am (UTC)no subject
Date: 2011-11-11 05:18 am (UTC)Tristan and...
Tiernan / Tierney
Teague / Teagan
Tatum
Tarquin
Torin
Tavish
Tormey
Taryn
Trevor
Tate
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Date: 2011-11-11 05:28 am (UTC)no subject
Date: 2011-11-11 05:32 am (UTC)no subject
Date: 2011-11-11 05:39 am (UTC)no subject
Date: 2011-11-11 06:01 am (UTC)no subject
Date: 2011-11-11 06:09 am (UTC)no subject
Date: 2011-11-11 06:26 am (UTC)no subject
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Date: 2011-11-11 08:23 am (UTC)no subject
Date: 2011-11-11 11:10 am (UTC)no subject
Date: 2011-11-11 12:11 pm (UTC)no subject
Date: 2011-11-11 02:25 pm (UTC)no subject
Date: 2011-11-11 05:50 pm (UTC)Theophile
Theodorias
Theodore
Tracy (a terrible name, imo XD)
Toby
Tripp
Tag
no subject
Date: 2011-11-11 06:11 pm (UTC)no subject
Date: 2011-11-11 06:14 pm (UTC)no subject
Date: 2011-11-11 11:01 pm (UTC)no subject
Date: 2011-11-11 11:37 pm (UTC)no subject
Date: 2011-11-12 12:26 am (UTC)welcome
Date: 2011-11-12 01:50 am (UTC)A new season,
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no subject
Date: 2011-11-12 04:06 am (UTC)no subject
Date: 2011-11-12 04:56 am (UTC)Thayer
Tajo
Tariq
Tarquin
Thane
Tivon
Titus
Thor
no subject
Date: 2011-11-12 05:39 am (UTC)Thorley
Tobin
Travers
Trevelyan
Theo
Terrence
Terrell / Terell
Tatton
Thad
Tal
Tarben (I don't know what it is I like about this one. It's Danish.)
Tasgall / Taskill
Taylan (This isn't as trendy as it looks. It's a real Turkish name. You can google it.)
Thales
Tor (I'm a fan of this for some reason.)
Tobiah / Tobias
Torben
Trafford
Trenton
Tully
I'm sure you can find even more here, but I'm too lazy to look.
http://www.behindthename.com/
no subject
Date: 2011-11-12 05:40 am (UTC)no subject
Date: 2011-11-12 06:41 am (UTC)no subject
Date: 2011-11-12 09:54 am (UTC)no subject
Date: 2011-11-12 11:03 am (UTC)